If you plan to defend, there's only one rule... 1. CALL!!! In seriousness, drop ALL the called items at that time, then make a path leading to the trap. I've had an instant where i have ALL of the Runners die at once. I'm not saying it's going to work 100% of the time, but it's VERY helpful. When it comes to Lvling up roles... Work with Defender, and Healer. Who cares what Lvl attacker you are, or what your Collector Lvl is. GOOD barb Assault groups only need to worry about Defenders, and Healers. Just little things i've picked up from playing for months, and months just to get good enough to call myself a real pro at the game.