Tongue tendrilspell (book of vile darkness) reads :
"The caster's tongue becomes a powerful tendril that she may spit up to 30 feet away. This tendril wraps around a target, lashing it to something if possible. The tendril makes a grapple attack using the caster's melee attack bonus, dealing no damage but starting a grapple as a Small creature with a Strength score of 20. (-1 size, +5 STR, +1 caster attack = +5) If (emphasis mine) the tendril wins the grapple check, it wraps around a limb or whatever is appropriate for the foe, lashing it to any nearby object."
Now here is the question. If the tendril fails the check... what happens to it? Does it attempt to grapple again the next round? Does it become inert? I am assuming it cannot move as this is outside the confines of the spell, but would it attempt a grapple in the original space it was cast in each round if it failed?