Why were you riding the slide lock?
Just where it is on the pistol and my thumb.
And contrary to belief, you don't keep a perfect grip while you are moving and shooting stuff.
Another reason why it is very important to shoot using both hands when it is physically possible.
I always cringe when I watch these bodycam videos of cops in shootings. 1 hand aiming on a suspect and the other grabbing for that damned radio.
Hit your single 13 button and be done with it.