Teleport Mastery is

So it's just an activation cooldown? That makes sense, because if Teleport mastery activated every time you used Teleport it seems like it could easily boost double a Bishop's damage output.

I already Teleport around like mad to fight bosses on my F/P, and it's really not that hard to keep spamming your attacks while doing it. Could be different under the pressure of fighting HT, though.