Sousuke was already moving when the explosives went off, but the resulting destruction on top of the earlier explosion was starting to destabilize the structure (someone probably should have put in more support beams instead of more things that blew up).

The place was starting to sag and sink further downward, but before it did, by god, he was going to get even with Setsuna for throwing him at that mangrove crab. He let loose with a spray of bullets, gunning for Seiei.