I saw this live at my brother's before we left for the colisseum (watching football on the west coast is awesome). That hit was Theismannesque. Classic case of the cleats getting stuck in the turf. You could tell from the slo-mo replay that the foot bone was no longer connected to the shin bone, to use medical terminology.
I also wish for a rapid recovery for this kid, but ankle breaks are in some ways harder to recover from than a messed up knee. or a tibia (a.k.a. shin bone). That's why ski boots end at the calf. If you're gonna break something, that's what you want to pop.