Havertz, I really like the chap. Proper bullet header.

[Peter]

I've only seen a still of the incident but his foot did look a leetle bit on the high side

You are allowed to kick the ball at chest height. If you watch it slowly, he does win the ball, and the Liverpool runs on to the foot as much as anything. His foot trails back on contact, showing there was no follow through or force behind it.

It definitely does not qualify as clear and obvious. And I think the ref doesn't give it because it just looks weird. It doesn't look like a normal penalty incident.

Ref might also have been swayed by the fact that Salah had flung himself to the ground 30 seconds earlier. Haven't seen many calls for a yellow card