I'm impressed the 3rd umpire went with his eyes, as it was a visible deflection that could not have come off the pad, even if hotspot again couldn't come to the party due to the angle of the bat. As I've said before, it's important that for referrals go up on such decisions, that it is reasonable to actually expect some sort of conclusion. Let's not let infrared vision deprive us of our other senses; if there is no value in what we see in replays, why waste time with them?
I wonder though, if you could use Hawkeye to demonstrate that a ball has deflected off the bat in a more clinical manner.