Rudy survived falling off a cliff, I dont see him losing this fight even in the ocean

Yeah no, Rudy can't breathe in water forever, if the mosasaurus was smart it would drown Rudy and not let him go

Well if Rudy cant swim, he loses but if he can swim, he wins because of his durability, I dont think the mosa could damage his osteoderms badly

Like I said he can drown Rudy, spinosaurids don't have gills and plus why would the mosasaurus go for the back and it can go for the neck or the leg?