During the battle, there is a moment when the Arashiyama team stops to rethink their strategy in an alley. Both Jun and Ai are severely impaired (Jun carrying gravity bullets, and Ai with a severed leg).
We know that when they deactivate their triggers, the Trion bodies vanish, and when the trigger is activated, it is rebuilt wholly.
So why didn't they just pop in and out of their triggers to remove those impairments?
We know for a fact that repeated trigger activations in the same day have an impact upon the users Trion reserves:
Osamu couldn't summon even a blade when he changed a second time in the same day, during episode 4. But it is stressed everywhere that Osamu's Trion potential is crappy, and they are Rank-A agents.