No mobs in Tul's Domain

I just spent a breachstone to enter Tul's Domain. I clicked the hand ... and nothing.
No mobs appeared, but the timer did.

Eventually the timer ran out. And there was no portal at the end of the domain. So I just wasted a breachstone.

EDIT: I think it may have been because of a delay AFTER clicking the hand. Perhaps I should have waited for a few more seconds before running off.
Perhaps you could consider making it impossible to run ahead before mobs have begun to appear. - Just so people like me don't fool themselves out of a breachstone.

This just happened to me. No mobs at all in Tul's domain. RIP stone.