Well, I know if it were me I'd attempt to stop shaking long enough to fling an arrow in its general direction.
Having said that, are there any other deer in that area you would shoot? Is there alot of pressure in that area? Will it make it through another season? If it were the last day of the season and you hadn't filled your tag would you shoot it?
I understand they can't be 200+ megamonsters if they get shot when they are mearly 170 monsters.
The 'Bonker