Someone has to go to the bathroom

After a few minutes of her being gone my buddy closest to me stood up.

"Hey man, I gotta piss baaaad. I'll be right back."

I thought my girlfriend wouldbe using our private bathroom down the left side of the hall and told him the other one was down the right. He quickly headed upstairs and everyone resumed what they were doing. I waited for quite a while and noticed my friend who went upstairs still hadn't returned. I got more and more anxious not knowing what was going on and decided to check it out.