With a mighty SMASH, Grumpy slams head first into the into the acacia tree!  
His horns, forehead and pretty much the first half of his face embed into the bark as the rest of his body condenses onto itself with the sudden, unexpected halt.
 
Wood chips splinter and fly everywhere as Sabe looks on from behind, wincing at the sight, feeling rather sympathetic. Though this is what he planned to evade from being pulverized.
 
He turns his head forward to see Uganda, standing motionless with her mouth agape in astonishment and disbelief on what exactly just happened.
 
 
Well, this page was sure a unique on to draw, for I had to squash an entire rhino against a tree, and somehow make it look like a really impactful collision. I think I might have succeeded!  
Also wanted to show the inertia still going in the rest of his body behind him to show that he’s sort of still moving.  
Laws of motion are fun to draw!