I always go back to: what would you give it without a replay?
If the TMO wasn't there, most refs are going red card where a bloke lands on his head after going into the air and getting hit by a guy on the ground.
For me, after seeing the replay of the incident, the slip is irrelevant - Foley was basically coming forward and into that space and the winger's timing was well off. No way was he getting up into a position to catch the ball if that slip was going to be his plant foot.
Yes his eyes were on the ball, and he'll get a "red card was sufficient sanction" because of it - he certainly shouldn't miss any more game time.
But it was extremely careless, a yellow card at the very least, and it creeps up into that Red category because of the outcome, not necessarily the intent. I don't think it was malicious but if we don't set a big, fat line in the sand we're going to have guys arguing the point.
And
that's what backs get for wearing slippers instead of footy boots