Did [url=https://youtu.be/f20u-8Kof3E]this[/url] in Iron banner today...
The trick is to not run away but to run straight at them and wear them out, like a matador fighting a bull xD
Edit: made an [url=https://www.bungie.net/en/Forum/Post/194563670/0/0]Iron Banner highlight[/url] video too if anyone wants to check it out.
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Incendiary grenade and blade. Destroys them.