So, I "recruited" the ogres in act 1 and got their horn. I summoned them in the fight with Fezzerk. One of the ogres died in the fight and after the fight was over the other two rushed to me and tried to get to me here (see image). But they weren't able to completely get on top and after a few seconds just vanished. Now If I try to summon them again my character says "you can't summon a dead ogre", which makes sense laugh but I didn't get any convo regarding it first.

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