@@Leafeon,
The sandslash successfully latched onto the tentacool's tendrils, shutting its claws back closed from their splayed position to keep the grip tight. "Spin around, now, Warden!" its trainer commanded, and the sandslash started to pivot around, swinging around the tentacool like an Olympic hammer-thrower. "maybe, just maybe, we can confuse the tentacool. Or, you know, throw it around for good damage."
Then, the tentacool regained its nerves, and fired a supersonic. Given the close proximity of the two pokemon, it most certainly hit the sandslash, who was befuddled and disorientated by the rays of light. The sandslash was already in the process of swinging the tentacool, though, and the sandslash was continuing by simple momentum.
Then, came the water. Pouring out of the spinning enemy, the water pulse went everywhere, spraying the battlefield down, and of course, hitting the sandslash for super-effective damage. This hurt the pokemon, of course, but the sandslash was quite confused already and the stinging pain of rushing water wasn't the first thing occupying its mind.
A stray splash of water was coming directly for Cecil, and he stepped back to try and avoid it. Unfortunately for him, the water still hit him. Or, at least, his shoes. "Gah! Why must this battle be such a mess? Soggy shoes are the worst." He sat down on the floor, and took off his footwear, showing his bare, tender but honed, feet, flexing and wiggling the toes to get any stuck water to drip off.
The sandslash was still spinning, having picked up quite a bit of momentum from the pulse of water. But, it finally tripped over its feet, and fell onto the ground, slamming the grappled tentacool down with it. "Sla~a~a~ash?" The pokemon exclaimed on the ground, quite dizzy and eyes still spinning, but still inadvertently gripping onto the enemy's tendrils due to his claws naturally wanting to stay closed.