Is this normal after hitting a guy in the groin?

Yesterday I was walking back to my car after work when a random guy came up behind me, put me in a bear hug, and started groping me. My self-defense training immediately kicked in and I was able to slap one of my hands back into his crotch, dig my fingers in, and squeeze like my life depended on it. He didn’t immediately let go of me, but he bent over slightly, grunted, and then I started feeling his jeans becoming wet. I realized that he was actually peeing himself. It was so gross and the worst part is that I had to keep holding on while it was happening until he finally let go of me. Luckily, he collapsed to the floor after letting me go and I was able to get away, but it left me completely grossed out. In all my years of taking self-defense classes I’ve never heard of an attacker wetting himself from a groin strike. Is it normal for a guy to do this after being hit in the groin?
Is this normal after hitting a guy in the groin?
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