Seems silly that they don't persist, but from what I can tell his +1(s) go away after he heals off his defense clicks. Is this the correct interpretation?

Edit: The point of the power is to make him stronger if you keep him alivel. If you heal off the power, you still have the tokens when you get knocked back, meaning you get +1 per token when knocked back on to it.

Just making sure I was correct. Wanted to make sure there was no weird duration effect going on.

In general this is one area they seem to be improving so in theory if there was a duration to be considered, it would be stated in the power. Hopefully this continues to be the case.