When your body is under extreme stress it relaxes muscles to save energy. Like when a long distance runner beep himself

Now now, come on, let's be civil, let's not piss ourselves. I would have thought fear was the reason too, so interesting to learn that.
No Guru, No Method, No Teacher.

This message has been deleted.

Urinating on yourself is actually quite common in a firefight. It's not about fear, though, as one might think. It's more the fact that you're so focused on what you're doing, that you forget to "hold it in". It was mentioned in a documentary I saw titled 'The Truth About Killing'.

I'm actually watching through the entire show again and I watched that episode in season 4 I believe they may have had a little tinkle or so because they were right on home base! It's litterally the last place the two officers would expect to encounter a hostile not to mention they saw multiple unies getting wounded