In Praise of the Sea Hare

[ponokareefer]

I was attempting to move the slug out of my quarantine, and it started to squirt, what I think is poop, out. I was wondering if this is normal for these critters or not? I stopped as soon as I realized what it was doing, as I am concerned that it was something lethal it was expelling. Can anyone confirm if this is normal or not? I was trying to be slow and gentle about it, so as not to hurt the slug.