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It's normally touch, but you can give it range, and it doesn't specify the target object has to be unattended..
Edit: ignore, I'm dumb today.
Its a 10 minute casting time, so that might make it not work in combat as you're hoping.
It might work if you're fighting a weresloth. ;)
I guess you could start casting it in combat...
And finished 9 minutes and 30 seconds after they're dead.