If you're sick of losing av all the time, try collecting all the bloods/crystals during one AV. DONT HAND THEM IN during that one.
When you have enough, get everyone to leave via the door, and wait for your debuff to go away. Note: because you left through the door, you'll still keep all your 'destroyed' items, (armour, medals, flesh etc.) importanty, the bloods/crystals. Now get everyone to hand in ALL the crystals they collected, and within a few minutes (depending on how fast people can hand in) you'll be ready to summon your boss, without even killing anyone!