excreting fluid as defense response?

I was trying to clean the mites off of my d grantii by blowing through a straw as I read that would be a good way to get them off. My beetle was not happy and kept trying to move away until finally he squirted clear excrement all over me! I’ve never seen a beetle do that, was it a defense response or just a coincidence that he “had to go” when I  was cleaning? (Mite advice would also be appreciated, I can’t find anything that doesn’t seem like it wouldn’t just cause more stress for the beetle)

 
I don't think that was a defense mechanism, but just "had to go" on you...😅 I just wash my beetles off on running water that's not too cold or warm with old tooth brush, or soft ones. I use my own fingers sometimes when it's not too bad.

 
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