are you ready for a rumble?

The more typical SJ becomes the more "boy like" behavior I am seeing.  It especially comes out when he spends time with Bob.  Bob is a typical older brother.  He likes to tease SJ.  When SJ was more stuck in the autism world, he didn't seem to care what Bob was saying.  Now that he is in our world more than his parallel autism world he is much more aware of what Bob is saying.  Bob will take his things or tell him things that are not true.  He does all of this to get a reaction out of SJ.  Bob is just doing what all brothers do, so it is hard for me to constantly be on him for this.  If a reaction is what Bob wants, that is exactly what he is getting now.  
Two days ago, Bob was teasing him about a video game that they were playing.  SJ couldn't take it anymore, so they began to fight at the top of our stairs.  SJ is fairly strong and the boys are practically the same size.  (SJ is actually a little taller and slightly heavier.)  SJ pushed Bob into our banister and then Bob pushed SJ into our linen closet door.  We broke up the fight and sent each of them to their rooms.  I was so upset about this fight, but my husband assured me that this is "normal" boy behavior.  We had a talk with them and told them neither one of them should be touching each other in anger. 
We had another incident yesterday.  They were jumping on the trampoline and Bob threw SJ's Crocs on the trampoline.  Why would this bother, SJ?  Who knows!  He started yelling at Bob to take his Crocs off of the trampoline.  Bob wouldn't.  He kept saying he wanted to see how high they would bounce.  Well, SJ was so mad he couldn't see straight.  He pushed Bob off the trampoline and he hit his nose on the metal frame.  Bob came into the house crying and Mom and Dad referee had to step in.  We sent SJ to his room and checked out Bob's nose.  It wasn't swollen or red.  We told him to put some ice on it, but he refused.  He is very stubborn!  (He gets this from me and my father)  We told him SJ shouldn't have hurt him, but he shouldn't be touching his stuff.  When SJ was allowed to come out of his room, we had a talk with him about why it is not acceptable to hit someone just because they touched his things.  He has a quick temper and we are trying to find strategies to help him defuse his temper.  (A trait passed onto to SJ from my husband's mother.) 
I will say that the nice thing about brothers is they move on quickly after the fight is over.  Maybe an hour after the trampoline rumble, they were outside tossing a ball back and forth.  I would much rather play referee for two "typical" acting boys then watch my two sons play in two different worlds.