I can confirm this strat works. Once you get it down you can repeat over and over. The dragons breath is the best tool for DOT. I ended getting about 20-25 in total last time. BTW, At the beginning of the strike you can run to the far wall and jump on the ledge wth the vines on it. This is a protected spot but you can still shoot. Don't use grenades or rockets though, you'll blow yourself up. Also, When you climb the stairs, only one person has to make it to the top. Once there everyone can wipe and it'll respawn everyone at the top. The next interior section of stairs is easy with the tether. Tether the wizard and take out with a raze lighter and all of the enemies will despawn. You have to do it fast. The whole strike can be run in about 7-8min if I'm remembering correctly.