You could argue its dangerous play
Jonjo never went in to hurt the player, yet he did after winning the ball
Accidental, yet punished
If the ref judges it to have been a two-footed tackle, under the rules it's automatically classed as dangerous play and a red card offence. I think the reasoning behind it is that a player who tackles like that clearly doesn't give a stuff whether or not he causes an injury. The question whether it really WAS a two-footed tackle is another matter, as unfortunately we saw in that incident.