If as a Daredevil, you wind up being defeated in a PvP match (it happens to everyone, occasionally), when you respawn you won’t have actually regenerated all of your endurance yet, due to your higher maximum bar. If fighting is particularly close to your spawn, you might not enter it at full strength as a result.
Please fix it so that a respawning Daredevil comes back into play with the full 150 Endurance!