You roll a thirteen...

Blood Edge attacks the middle trendril again with his longsword, this time cutting it for two damage. The middle tendril is defeated, and turns to dust...

Moonflower: "Yay! Do we get experience points for that?"

Sweet Biscuit: "Not until combat is over."

Moonflower: "Oh, okay. S'it my turn? I wanna cast, uh... Thunder Clap!"

After getting back on her hooves, Tailkicker rears up, then stomps the ground, sending a wave of electricity toward the remaining tendrils. The two enemies are shocked, and fall to the ground, paralyzed temporarily.

Whirlpool: "Well done! Time to finish them off!"

Whirlpool swings her flail at the left paralyzed tendril, hitting it for two damage. As for Opaline, she continues to remain at a safe distance, waiting for somepony to get injured.