I was doing the archon priest strikes and was the last guardian standing and I picked up some heavy ammo, I look around and see that the boss is about 60m away with almost no health left so I pull out my shitty blue rocket launcher reload and fire. However as soon as I fire he teleports right in front of me and tries to shrapnel launcher me. The rocket still hits him and kills him but as he was so close the explosion killed me as well thus meaning we have to start from the last checkpoint :/