Impossible Double kill

After reviewing the video several times, I've come to conclude that the Xin in the video NEVER touched me. The reason he got the kill is because of my mastery "Bond of Stone". When he hit thresh, I took a portion of the damage, thus granting him the kill on me.

is probably thinking to himself:

".... just don't question it and move on."

The only thing I can think of is that he had a charge of smite available.

LOL

I had an awesome double kill the other day but unfortunately wasn't recording. I was playing varus vs cait&blitz and I had left them both with one auto of hp and I had about a 4th left. I was going b (because my lane was pushed and didn't want to risk getting ganked) and they decided to make a flashy play with blitz pulling me in and cait waiting in a warded bush to finish me off. Blitz goes to pull me, I AA and the AA lands a fraction of a sec after his pull finishes to kill him before he knocks me up but also quickly putting me in range of the "hidden" cait. Thanks to my passive I click the cait and get an easy double.

was at the edge of "Crescent Sweep" knocked barely by it...

It didn't look like his Audacious charge hit Malphite, though I don't play Xin, so I'm not sure what the AOE effect is. He may have smote him though.