Just had an experience with the Dark Devices FATE where we spent a good 7 or 8 minutes whittling down the last boss only for a player to come in at the last 5% and Provoke her and pull her out of range so that she reset.

This isn't the first time something like this has happened and unfortunately I didn't happen to get a look at the player who did it but this seriously needs to be addressed in some way.