After Forest hurt the knee it was in his favor all night. Just look at the limping and protection of if in rds 2-4 and then the lack of any power in the punches (compared to what is needed to take Froest out) in the 4th and 5th rounds. Simply, that injury cost Rampage the fight.
The upside, it was a solid fight and I'm glad it wasn't a 30 seconds and done knock out. These guys are still healthy and will fight each other again, you can bank on that.