Jack in the Box vs Minions

**sorry for the picture taken with a phone, screenshot function doesn't work for me (PCs fault // the screenshot is just green or pink in colour) I have not yet understood why does it happen but sometimes, when Shaco fears a minion, it just goes mental and literally goes AFK. I have encountered this twice already in a normal game and was able to reproduce it in a custom one. I am unable to tell if JitB (Jack in the Box) level means anything, but I haven't gotten the bug if JitB wasn't at least level 4. In the custom game I have been able to induce this bug by pure luck, it seems. Just spammed JitB onto minions until it happened.