Catgirl has no gun on this floor; she must rely on the spike pits to hunt.
Catgirl has to avoid touching ghosts, and being shot by triggers.
Despite having no gun, catgirl can mentally pull her trigger (left mouse button / A button on controller). This causes the triggers to fire their guns, damaging other creatures and sending them down to the spike pits.
Catgirl can do this as many times as she wants without starting the timer.