I don't think I will ever try with rogues but I could see being able to take the healer out with backstab and maybe another wack then killing spree and fan of knives then go from there. I don't do hardly any arena at all, though so I am just theorizing.

Edit: Sapping their plate wearer might be a good idea. Too bad you can't quickly focus on each of them and sap them and take care of them one by one. At least I couldn't do that.