Palace defender should have been off for starting it. Apparently.
I don't know the rules of the game well enough anymore to comment fully as I've only been watching football for about 35 years (is walking agressively whilst wearing a city shirt still a red card offence?), so not nearly enough time to keep up with the premier league rule changes, but if he's tried to do it twice in the same game then I'd suggest more than the standard 3 games should be applied.
If he connects properly and fractures someone's nose, or worse skull, then they'd be out for more than 3 games. He should be told to publicly apologise to the palace defender too as maybe he'll start a new Merseyside trend.
Best of all though, premier league defenders know he's a mard arse now. Am sure that will come on handy in their tactics in future.
What a home debut!