Board Thread:Off Topic/@comment-27144409-20180525193802/@comment-26173711-20181225013355

Hm, you're right. I'll change it to "low enough to render a normal Huntsman inable to continue fighting."

My explanation is that Tobias' aura is unique in a way that even with little left, he can use whatever is left to activate his Semblance. Think of it as the spark for a fire.

Thankfully, his aura does not seem to run out often, so he should be fine.