Yep, I wouldn’t want one thrashing around in a boat.
Fighting is what all males do from a young age to attain alpha status. The Alpha’s job is to protect the ‘mob’ and will give you a nice big hug and then disembowel you with both massive feet with long claws using it’s tail as a third leg. Adult males are around 6ft and very buff. Having said that, roos will nearly always just hop away if you come near them so feel pretty safe around them. No one should ever go up to them in the wild. The worst scenario is a lone adult male as it is an ex-aplha that has been ostracized by the mob and will instigate a fight with anything just to prove that he’s still got it… run away but it will chase you!
Fan fact - the females have three vaginas and are constantly pregnant.
Found a great Attenborough piece on the fighting: