I think the tank is referring to using Blood for Blood (+30% Dmg Given, +25% Dmg Received) alongside Foresight. (+20% Defense)...
It is a proper way to increase DPS (which makes the dungeon faster) without really suffering too much extra damage and making life for the healer horrible. The tank is obviously leveling an alt, and wants it to go faster and tried to deal more damage (faster run) without inconveniencing the healer very much.
It's just someone (archer) getting angry they didnt get to control another player. This tank obviously was making effort to meet his and his healers "needs".