While something like this is not an automatic ejection in every case, it should have been in this one. Watch the play closely. See how many steps the kicker even took after he came back to the ground and regained a "normal" run after the kicking mechanics were completed. One, if even that. Matter of fact, this is the kind of thing that gets players suspended and fined in the NFL, and I wouldn't be surprised if some state HS associations might even suspend the player after the fact even without a penalty on the field.