It's because you're taking 8 damage a hit. Assuming you're running mending at +4 regeneration, you can only take 8 damage a second otherwise you will be losing HP, and with a lot of griffons around you...
Your friend is probably using a lower HP build, such as 55 or 105 making him take less damage. If you can't get your HP down that low, I suggest you use healing breeze for extra regeneration. In addition, use balthazar's spirit and essence bond if you're not already, and aim for a -1 energy when hit protective bond by getting protection to 16 and using an item with +1 protection prayers X% of the time if you're not already.
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