If you don't then acid patches will appear out of nowhere and lose health mysteriously. If you did poof next to your blasted buddy, hurry and get onto the draw bridge. After a few seconds you should either poof to your blasted person or poof next to the Al Bots if you haven't killed them. Then Take A Break then come back right away. But what about the person with the grenade launcher? Once the blasted person gets onto the draw bridge safely, (if you want then start the horde) then run to the juke box and get on top of it and crouch. If you do this right, you'll fly up there. ) Then jump as fast as you can while the grenadier person shoots at the corner of the sign thing behind them.
Once they are dead, get onto the closest pole to the drawbridge (I'll recommend the one on the right side. Have one person grab the grenade launcher but first kill the Al Bots ( computer- controlled people).
This only works with the Passing content.