How do I tell my roommate he got piss all over the floor without totally embarrassing him?

Listen, my roommate is a cool dude, he would never do something like this out of carelessness or just by being a slob. However, he did get a huge puddle of piss on the floor that I stepped in while trying to use the bathroom, so like, he should probably know what happened and clean it up.

But again, like, this was clearly an accident, he’s usually a very clean guy who takes good care of our shared space. I don’t want to mortify him by saying I witnessed his piss mistake.

Reddit, help, I don’t have the social skills to approach this one delicately.

EDIT: plot fucking twist it wasnt him. we have two other roommates but theyre both women and one of them is on a trip. who. who pissed on our floor?????

EDIT 2: turns out the toilet really is just broken. post canceled everyone go home