Suggestions against summoner?

[Vaeria]

Pop hotbarred mega-dex potion > Raging Strikes > Barrage, and pay your trusty tank 1k to dance with the healer for about 10 seconds

[Kirschey]

Purify dots and then pray they aren't a decent player. There are a few 3man groups with a smn in it that put out so much damage so quickly I feel as if I am made of paper. It's like...walk out the gate and 3 team members are dead already. I don't like situations that feel futile and you can't out-skill what is happening by any means.