"I applaud a peaceful solution, Professor Pantarai, but it seems a temporary solution at best. If it's decided the lake is plentiful hunting grounds, I'm sure it will return, and we'll have to repeat the process. Perhaps we could Obliviate the creature and then lead it off, so it forgets we're here. It's risky in the long term."

But maybe they could figure out a better plan in the interim. Find some professionals to take the thing back to it's home.