I'm continuing this topic based on more testing.
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I noted origionally that Foetracer was not activating it's secondary ability of increased damage to targeted low health guardians when using Crimson. I've found in more comprehensive testing that the secondary ability does not activate using any weapon.
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Originally I had thought I saw it activate with Vigilance Wing, but I continued to test and review game footage, and have noted consistently that the secondary ability trait of the Foetracer Exotic Helm for Hunters is not activating on any damage types, or with any weapons.
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This is a bug. This ability should be activating based on the text description, and it is consistantly not activating under a large and varied testing pool.
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Good find!