so when the ment and his pet get both mezzed out at the same time, release the pet nothing happen, the charm pulse tick again then the pet is demezzed and you have to release it once more... pretty sure it's not suppose to work this way, the first release should be enough to break the cc on the pet.
also, i'm not 100% sure on how it use to work back in the days, but on live right now, the pulse should keep going even if you're mezzed (well at least you can spam it even being mezzed cause its instant just like the minstrel one) right now if you mezz the ment, at some point hes losing the pulse and it start working again once he is out of the mezz... i'm not sure if its working well or not but it's pretty bad for the ment since he can be cced out pretty easily with the way it works right now.
also, i'm not 100% sure on how it use to work back in the days, but on live right now, the pulse should keep going even if you're mezzed (well at least you can spam it even being mezzed cause its instant just like the minstrel one) right now if you mezz the ment, at some point hes losing the pulse and it start working again once he is out of the mezz... i'm not sure if its working well or not but it's pretty bad for the ment since he can be cced out pretty easily with the way it works right now.