Was fighting overseer in cav eq and he managed to autoblock parry stun my moleman when true accuracy was up. I had no disorient or anything other than the passive heal block from the node. Video should be here:
http://imgur.com/gallery/YMhJcJPStandard stuff, android os, galaxy s20+, latest mcoc update, on my home wifi. So far only fought him in cav difficulty so no idea if any where else.