I had a sizable zombie army entangled for another 3 hours yet. Another zombie army of the about same size walked past/through them. When they met, they merged into one larger zombie army that was moving freely; nothing was entangled any more. Is this meant to work this way? Maybe they shouldn’t have been able to merge while being affected like that. I suppose if they are going to merge, I (of course) would rather have the new army entangled too (for whatever time is left of the spell).
I found the source of this bug yesterday and fixed it up. Should not see it any more.
Thanks for reporting. I’ll see if I can fix you up with some hero coins.