Hmm, that seems like a bit much. It's kinda by design so that you can't just go on forever and might back yourself to a corner/edge with an enemy where you can't immediately match. And that's where the different skills come in too. There is a skill with pretty much exactly the functionality you mentioned except for it triggers when getting hit and not with an interval. Of course I guess it is possible (though astronomically unlikely) that you'll end up in a spot where you can't make any matches at all.