Spread out or GW and run from the warrior, or do what I did in the beginning, have a slave autorun to the middle of the area and stand there the silly warrior will charge and blow bladestorm on the solo gazelle 9 times out of 10. Kill him while he tries to get to you. If he doesn't come after you just heal the dummy target a couple times and proceed as planned minus the BS of death.
Not sure why but the warrior always seems to be about 10 yrds out of range of his healer and can typically be killed if you're quick enough, at least in the lower ranks.