There are two things you can yell when you see a person creeping out of a pile of rubble that should probably have seriously injured them. One is something along the lines of 'stay where you are/hands on your head/what the hell are you/HOLY SHIT'. The other is 'oh my god, are you okay??'. Guess which one Steve opts for first?

"Careful! Careful, don't hurt yourself worse!" He's holding his shield as he slides off the motorbike and comes to assist, but there's nothing particularly aggressive in his posture. "Take it slow, you're...relatively safe."

I mean, he has no idea what's causing the anomaly but aside from that, they're in a pretty decent neighborhood and the weather's nice and warm?