shrine wont stop healing

[Sloppy Slime]

I was playing alone on the match map (went through the console) and I wanted to try stuff on the patron. comes the time I had to destroy the shrines and one just would not stop healing, couldn't get enough dps to even try fighting the patron, don't have footage but I have A screenshot

 

[Sloppy Slime]

RESOLVED: Apparently towers just regen when there's no creeps around, I feel like this should be taught in the tutorial