This is generally a bad idea. Eiji doesn't like explosions enough when he's fighting, but in normal human form, the sound and shockwaves are bad enough he's shaking.

He's ready to go home when he sees Chihiro lying way too close to the fireworks.

"Chihiro, move!"

It should be enough just to warn her it's not safe there, maybe go over to help, but he's not thinking that clearly. Thus, screaming and running over at full speed.

Sorry about making you panic too now.