Threaded blast seems to be working since the damage is the same as when I use a legit strand weapon but not untangler. It does not suspend when I pop a tangle with an osmosis weapon turned strand.
Edit: It appears allied unraveling does not work either when you use an osmosis weapon. used grapple, took 5 kills back to back and no activation. Switched to Perpetualis strand auto rifle, took 3 kills and it activated.
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Because osmosis isn't an actual strand weapon. The weapon itself needs to be strand, not temporarily changed by perk