I've been informed of a method that involves killing Ahrim and Karil quickly with prayer, then finding the tunnel and safespotting the melee guys by opening and closing doors near rooms with safespots. I like how this sounds because I've been told I wouldn't break even with Prayer Potions. My questions are: 1) how effective is this? 2) If I'm wearing rune, will I be able to run to my safespot? Or will the brother hit four 20s on me while I run? 3) Assuming I have 70 attack, strength, defence, Magic and 43 prayer; Will I be able to kill Karil then Ahrim without using a potion? 4) How often will ahrim hit me with 70 defence and Red Dragonhide?