When I tried going there, the grawls would respawn so fast I didn’t have the time to progress far enough in the cavern to get the skill point. Especially when battling the veteran grawl, which, like most veteran enemies, take more time than a regular “enemy” to die, I would get respawns at my back and get killed from overaggro (even though I didn’t move back into those mobs!). I finally got it when a group pulled the veteran into the skill point alcove, away from the rest of the grawls.