Collapse, Thor/Steve!!!!
Thor thought it would be a good idea to walk to his date since he had time to spare, then he go caught up in a large crowd, got lost for a few minutes, had to chase down someone who stole his wallet, and long story short he should've gotten a cab.
He decides to call Steve and make sure he knows Thor's not blowing him off.
"Steve, I apologize for being late, you will not believe the day I am having, I will be there shortly," Thor tells the voicemail.
---
As Thor approaches the block of his destination he stops in his tracks.
The entire building and a few around it have collapsed, no sign of why or how, and it seems isolated.
"Steve!" Thor runs to look for his date.
"Whoa! You can't go in there, big guy!" An officer stops him.
"You don't understand! Steve!" Thor desperately tries to get around him.
"Sir, please stand aside, I'm sorry, but if you're brother or whoever was in there, it'd be a miracle of they're alive," the officer pushes him away.
---
No body is identified as Steve, and Thor hopes, prays, that he wasn't in there, but he doesn't see him again after the accident...