Boomer Is Injured

On Wed afternoon, I heard cats fighting and when I went out to look for Boomer, he wasn't around.  10 mins later, he came home, covered in poo and sand (this is the 3rd time).  I gave him a bath and he seem alright.  He even came inside to play with Meow-Me, Coco and Felix in the evening.

Later, we went out for dinner and when we came home, I found Boomer limping.  He had somehow hurt his left hind foot.  When I tried to check the foot, he would cry out in pain and try to stop me.  After close examination, I found no external injuries so he had probably twisted or sprained his foot. The painful part seem to be very near the paw pad.  We think he either went out after eating his dinner to look for cockroaches and got confronted by an alley cat and in his bid to escape, somehow ended up injuring his back paw.  OR, some human chased or threw something at him?

He is now in his cage, resting.  He seem very very tired.  I don't know what happened exactly but I'm just so glad he's home and he doesn't seem badly injured.  Please send purrs that he'll feel much better in the morning and that the injury is nothing more than just a sprain.  Thanks!

I have an ouchie on my left hind leg...

I don't feel very good and I'm going to sleep now....