I'm still not 100% sure I understand, but it sounds like what you want is to stop Bob reassigning the issue to someone else.
Have a look at the permission scheme - you need to modify it in a way that says "Bob is not included in the people who can assign issues in this project"
I'm John Allspaw, co-founder of Adaptive Capacity Labs, where we help teams use their incidents to learn and improve. We bring research-driven methods and approaches to drive effective inciden...
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