Tentacle feat

However, D’s body veered appreciably as he tried to leap the brook in a
single bound. In the next instant, he landed waist-deep in the current with a
splash.
Who, if anyone, had actually seen the tentacle that’d shot from the
water and wrapped around his ankle like a whip?
And there wasn’t just one—the second D hit, a number of identical
tentacles flew up and wrapped around both his wrists as tightly as possible.
Something with what looked like a striped carapace broke the current ahead
of D.

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