Does Bloodthirst affect DS #4 ?
Bloodthirst: Siphoning health is 50% more effective. Adept trait.
Does it affect life transfer ?
It would if you could heal in DS. It does heal you when you get kicked out of DS while still channeling life transfer though.
Are you talking about the traited version? Last time I checked Life Transfer simply keeps giving you life force even if you get kicked out of DS.
As for the original question, nope, don’t think so. Life Transfer gives you life force, which has nothing to do with life siphons (blood magic traits like vampiric etc).
http://wiki.guildwars2.com/wiki/Transfusion
base heal for this is 292 a tick, not affected by heal power, so test it out and see if it goes higher while bloodthirst is traited.
With 15 points in blood magic every hit life steals. So life transfer will heal you if you get kicked out of DS.
But that’s the trait we’re talking about there, not the skill itself. Still, I see what you mean, and that is indeed correct.