This is the blood lake. I need some time to perform the ritual. You must remain outside and keep the monsters at bay. Can you do that?
Keep the monsters at bay while I perform the ritual!
This is the blood lake. Impressive! But we must not lose any more time. The performance of the ritual will take some time. My concentration must not be broken under any circumstances! You must keep the monsters from me. Go through the passage over there and keep everything out until I have finished the ritual.