How would you explain someone being entangled by an arrow. In some situations, I can see a trick shot where the arrow pins the guy's cloak to his loose pant leg, but what about a troll who's nekkid?
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Since it only occurs if the attack hits, you could describe it as the arrow sticking into the flesh (of your nekkid troll) and pointing out at an awkward angle that prevents it from swinging its appendages as it normally does.
Until it breaks away at the end of the round (duration of the condition).
I suppose, that's a possibility. The arrow sticks in an inconvenient place that gives the same hindrances as being entangled.