As a general rule, I do my very best to keep a bubble, as well as a HoT on myself at all times. Reapplying the HoT keep procing the conveyance (I think thats the name of it) and makes your big heal cast a second faster. Helps not only your team, but yourself in those situations. I generally have a enough of a cushion to deal knock the stealth mpds back, snare, stun, and all those goodies doing that. And of course, make yourself as hidden as you can.