First things first Tangle is on a flat 15 second cooldown that can be triggered when you do not need it.
Second if I read it correctly you the warlock with the aspect have to throw the tangle for the suspend to happen. The problem with that is other people can pick up your tangle and waste your aspect.
Finally the Tangle can be shot by said teammates and it will ruin the whole point of the aspect.
My suggestion is change the wanderer to
When you have perched threadlings you can trade a threadling for an arcane Needle and give it a 5 second cooldown to prevent hard spamming.
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Too late to design a new aspect but I'd like that but the arcane needle would end up with a 20% damage nerf if that happened. It would be easily spamable and cheesy in PvP with impact indicators X3. I'd rather see a fragment that reduces the cooldown of tangles to 5 seconds plus a discipline and strength boost to benefit all classes current and future builds