Should this work during combat?

Have been fighting him for a couple of days, and this is not the first time it happens. One time he was convulsing. So, engaged him and this happened: Player kneels before the Totem of the Venoms, speaking in twisted tongues. A strange darkness descends over the area, blinding you momentarily. When the light returns, Player is gone. Player is in perfect health. Cool power, but should not the adrenalin avoid doing it (perhaps like the tribunal pillars)? Kneel during combat before your opponent looks not very smart. Thanks you for the attention.