Sorry to bust your bubble on the Roo rage, but the still photos are fake. You can tell when they show the real video and it looks like any other roo.
Taking you seriously for a moment, are you sure? Here, take your pick: https://www.google.com/search?q=The...CAaACdpgDAJIHAzAuMaAH8AE&sclient=gws-wiz-news Meanwhile:
A motivated ostrich might take a red kangaroo as they can sometimes fight off lions. It is harder to picture a kangaroo defeating a lion but Roger might have a chance.