Unfortunately, his suit, as advanced as it was, couldn't protect him from the power that the gems radiated when he clicked his fingers. This is why almost half of his body got burned, resulting in fatal injuries.
Throughout the course of Avengers: Infinity War and Avengers: Endgame, Tony Stark's life was spared on a few occasions. This happened when he survived Thanos' snap, but Doctor Strange also ensured that he would live to experience that moment.
This means Strange considered two different possibilities. Either Tony had a 50/50 chance to survive the Snap, or he knew once Thanos took him up on his offer that Tony would survive. If Strange had opted for the 50/50 option, those were still far better odds than one in 14 million.
Smart Hulk was "made for this" as his own exposure to gamma radiation, both in the initial accident and later on to combine Hulk and Banner into Smart Hulk, matches that of the Stones' radiation. So it seems he always had a greater chance of surviving the snap than Tony.
What If Iron Man SURVIVED The Snap-In Avengers Endgame?
Why couldn t Tony talk after snapping?
And seeing as Tony is far weaker than Thanos, Tony was dying immediately. He didn't have the energy to even speak, all he could say was “Pep”. He was a dead man from the moment he snapped his fingers.
However, Red Skull told Hawkeye that Black Widow's death is permanent. Later, the Hulk (Mark Ruffalo) says that he tried to wish Black Widow back into existence when he held the Infinity Stones, but that it wasn't possible because, as Red Skull confirmed, the magic of the Soul Stone requires a permanent sacrifice.
Hulk intended to bring the dusted back; when he snapped, it happened. Tony intended to destroy Thanos and his army; when he snapped, it happened. The effects of snapping your fingers with a full Infinity Gauntlet aren't set in stone, it's just what you want to achieve.
The stones were causing a massive surge of power to go through Hulk and he was unable to snap for a moment because the pain was basically paralyzing him.
In the end, Tony Stark snapped Thanos and his army out of existence and dies because of the irreversible damage his body has suffered from the Infinity Stones.
While the Avengers debated who could wield the Infinity Stones and save the universe, Hulk was ultimately the one who was deemed strong enough to survive reversing Thanos' snap.
Characters like She-Hulk, G'iah, Gilgamesh, Adam Warlock, Hercules, and Wolverine also have the potential strength and abilities to survive the impact of using all six Infinity Stones.
Who did Tony Stark see when he snapped his fingers?
After Tony snaps his fingers while wearing the Iron Gauntlet, he's transported to a mysterious place. As he tries to gather what's going on, he hears a voice call out to him. Tony turns around to see a grown-up version of Morgan, played by Langford. Tony quickly realizes the young woman is his daughter.
looks to Doctor Strange near the end of the final battle, and Doctor Strange holds up one finger, indicating they've got their one chance. This spurs Tony to make the ultimate sacrifice: Taking all the Infinity Stones for himself and snapping his fingers to destroy Thanos' army.
However, his ability to hold his own through much of the fight proves that despite his weight gain, he was still an MCU powerhouse. It was Smart Hulk's opinion that only he could do it, but it's possible that Thor too could have managed the snap, but perhaps not without suffering even worse side effects.
The Russo brothers also revealed that, despite not appearing in Infinity War, Betty Ross and Sif were blipped as well. In a mid-credits scene in Ant-Man and the Wasp (2018), Hank Pym, Hope van Dyne, and Janet van Dyne are blipped, leaving Scott Lang stranded in the Quantum Realm.
Here's a breakdown of what She-Hulk episode 1 explains. Warning: This post contains SPOILERS for She-Hulk episode 1! Bruce Banner's arm is fully healed after Avengers: Endgame thanks to She-Hulk: Attorney At Law.
Thanos threw Tony away, he couldn't have got to him in time to stop him from snapping. A ambush is a surprise attack, he couldn't do that when they were looking at each other as Tony was going to snap his fingers. Also thanos never had the space stone, how would he know how to use it.
The fact that it severely wounded the Jade Giant emphasizes just how powerful the gauntlet and its constituent stones are, and if the Hulk can't wield it without injury, it doesn't bode well for more fragile, and crucially mortal, human Avengers like Tony Stark.
Yes, Thanos could have snapped himself and he seemed genuinely surprised that the 50:50 odds allowed him to live. Had he been snapped, it's likely that the gauntlet would have materialized on the planet he would eventually make his retirement home.
Hulk couldn't bring her back because you can't use the power of the stones to resurrect her as the exchange is permanent, but when Cap goes back to return the stone he could exchange the stone back for her soul.
With all this armstory between them, when fans saw Nebula had a new arm in Guardians of the Galaxy Vol. 3, they suspected it might be related to Bucky's stolen/borrowed limb. But James Gunn has confirmed that is not the case. Nebula's arm is not Bucky's; instead, it is its own creation.
Because no funeral that Endgame would have been able to show would have lived up to the one we can now imagine, knowing what we know after Natasha's standalone. Nat's funeral wouldn't have been a respectful private gathering, it would have been an international event.
