if anything, it increases both of your skill ceilings because the rogue has to discover what combination of moves best suit that limited duration and you have to figure out how best to counter it with the tools you have.
He doesn't have to discover anything though, garrote for the silence, premeditation if it's up, then AMBUSH AMBUSH AMBUSH AMBUSH AMBUSH, or just use the entire dance for a shadowstep sap. All it did was make him think less of, should I cheap,ambush, or garrote on the opener? Now he will do whatever and dance after. Who cares he can do it all now.