That is LITERALLY PETERS REMAINS on Tony’s hand – Like?? what the hell does he do?? Start to wipe them off on his jacket, but then realize that it’s ALL he has left of the one boy he thought of as a son when he so desperately wanted children??? Cradle his hand against his heart in mourning and disbelief (“I’m sorry, kid, I’m so, so sorry, Peter.”)?? Desperately grab at the ground where his dust lies????? Dude just THINK about the intense flashback Tony’s gonna get if he’s a father later on down the line when one of his kids says: “Dad, I don’t feel so good. I think I’m sick.” He’ll only freaking be able to see his first boy he loved as a son who literally died in his arms and be reminded of the fact that he thinks he failed little Peter?? Yeah no thanks