You can easily react to the bakar companion. There’s a buff that’s applied on both the player with the bakar and the bakar itself. It’s a 6 second buff that will copy all the damage the player does in that time frame and then the bakar will unleash it.
If the bakar is CC’ed or doesn’t have a target to cast it on when the 6 seconds is over (if you CC or feign death when it’s at 1 second or something) then the bakar won’t deal the stored damage.
You can easily get an addon that tracks buff/debuffs and add Fatal Bite to it that will tell you how long it’s up for. It’s very easy to counter.
It’s crazy that people don’t know about this and say it can’t be reacted to when you literally have 6 seconds to react to it. That’s a long time for a PvP fight.