I just used end key to skip to the bottom of the arena fights page, missclicked the Buy button rather than the Fight Button and blew 50 trophies to "skip" a single fight. Annoying.
If you're just working through 2 or 3 fight tokens, the main thing you'll focus on is the actual fight report; the rest of the process becomes mechanical. I could have avoided that mistake if the button was right-justified on the page, hidden or had a confirmation step (though that last could become nag-y).