It's enough to stop him cold. Whether or not Tony wanted to hit Jack in some strange soft spot, he apparently has - and the emphasis is on strange, because his face blanks out, attention drifting from Tony like he's suddenly stopped existing. Nevermind what he's saying, or might have left to say. Jack starts picking through the headstones like he doesn't believe Tony, relying on fuzzy memories to guide him to the right one.

When he finds the right one, he kneels down to touch the lettering - and then just sits there, off to the side like he's afraid of sitting on her, dirt and blood and who knows what else in his hair and clothes as he takes it in. Sofia Dawes, loving daughter, wife and mother. There's his name, right there, on a headstone ten times nicer than anything Jack could ever have afforded her.

"...Hey, Soph." A beat. "Been an asshole again. Sorry."

It's like she's not even dead. Tony might want to go wait by the car or call a cab or something; Jack's chatting away, updating her on everything he's been up to. Finishing high school. College. Kicking his bad habits (the illegal ones, anyway). His work.

It might take a while.