First off, I've done this quest before and have helped other too. Yesterday I was asked to help a friend, and ugh...it was pretty frustrating.
If the point is to kill the boss and the knights within 30 seconds, why not just start the mission just prior to the boss encounter?
It's rather frustrating to run an entire 300 light strike, only to find out at the end that your companion(s) are complete dorks. Don't get me wrong, some people answer a text message or join the team-chat and it's all easy peasy from there but others either don't care or argue saying it's too difficult or insist killing the knight right away will work, and then when it doesn't work they won't leave.
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I thought the level 300 strike was easy. I helped a guy who couldn't kill the three knights to open the door to fight the big knight in the sword fight. In return he was going to run the sunless cell strike with me and my friend. So we ran him through it and then dipped out on us without helping us. Utter douchebag.