Just stop targetting the mob with your tank.Basically like in Krelitz contested, The mob in there requires you to stop attacking while reflect is up. I have been Looking at ways to control bots like this but have failed miserably they end up killing themselves. Pause on the MCP doesn't seem to work they just go nuts, i tried many things and still the stubborn toons do as they please.
I feel like I'm extremely confused... Is this a secret mob? If you can tell us the name of the mob we may be able to better provide suggestions. So far I just don't understand what you're trying to do at all, so I can't really offer any help.that did not work for me mob hits instantly retargets everyone dies.
also on a different fight in an older zone i decided to go there where i knew of a stop dps mob to run tests and try to figure it out.
i tried all kinds of random techniques before running out of idea's, also watching the healer and found that on a heal sometimes they will get the one shot death result as well hmm. to ad there isn't a quik edit button like this.
StopAll
tanks stoneskin
stop all
8 seconds.