Malicious contact or nothing?

[jTheUmp]

After my game ended tonight, after changing out of my umpire gear I hung around for awhile to watch the JV game finishing up on the adjacent field, when I saw this situation:

R3, 1 out. Batter swings on strike 3 in the dirt, which caroms off F2 into foul territory towards 1st. BR starts running toward 1st. F2 fields the ball, throws to F3 for the second out. R3 breaks for home. F2 runs back to home and ends up setting up in foul territory on 3rd base line extended for the throw from F3. R3, running at full speed, steps on home plate and collides head-on with F2.
R3 made no attempt to slide (which I know he isn't required to do).

PU had nothing except an out at 1st and the run scoring.

What say you?