Swarm Grenade

The little biter it summons walks rather than flies, so it spends most of its time scrambling to keep up with you. Get far enough ahead and it bursts into pink smoke, then reappears in another puff the moment you plant your feet on something solid. It does not fight anything. This is decoration that runs around.

It needs floor space to stand where you are standing, so tight perches break it. If there is nowhere for it to fit, it drops past you, falls out of range, vanishes, respawns above and falls again, cycling in and out of smoke until you move somewhere with room. Nothing is actually wrong, but it looks like a bug.

The Zoologist only shelves it while a Party is running, so you either wait for one to fire on its own or start one yourself with a Party Center. It is a crossover with Dead Cells, where biters normally show up in swarms and do rather more damage than this one manages.