Aloha,
If it was my clownfish and anemone, I would have held the anemone with the tongs on each side of the clownfish and reached in with my other hand to forcefully pull the little guy out. The anemone would hardly be phased even if some tentacles were cut off or damaged.
The only anemone I might be afraid to do this with is Griffith's large carpet.
Very sorry for your loss.
Mark