Hey, great job!
I like your simple animation, and especially that you could choose which knight should win.
However, no comment without constructive criticism!
I would suggest that, if you have time, you add some setting for the knights.. E.g. make a crowd watching, a castle on the horizon, or any other kind of background you imagine.
Second, why not extend this game? You got the basic animation down, so you could try making an iterated version of the match. Instead of choosing who wins, make it random, and allow the user to bet on the winner.
Or, just do several run-throughs just to make it more dramatic.
Keep it up!