Bart stopped and sniffed for a moment, something in the wind having caught him off guard. He made a face. "You smell that? It smells like natural gas." He knew because one time in chemistry he'd left the burner on by accident and the entire wing of the school had to be evacuated until the gas could be dispersed and that's what it had smelled like.
"We have to get these people out of here." He said to no one in particular, looking around at the gathering of folks who were rubbernecking at the explosion. "Do you think you can help with that?" He said, sobering (albeit just a little) and trying to find a way to get the kid out of harm's way an also let him feel like he helped. It was a nice thing to do for civilian kiddos (although the kid didn't really look that much younger than Bart.. and in reality he was probably several years older than him anyway).