It breaks. But now you're just adding arbitrary conditions. If you want it to loop without breaking when the tempo changes, load it into Simpler, turn off warping, and create loop points around all of the audio that you want. And then create a single MIDI note holding it on for as long as you need. Or if you need something really unusual, load a looper plugin into Ableton--there are tons. You're acting as if problems that only require a few minutes of cursory thought are impossible to solve.