I really don't want to take risks and go down, but okay... I'll retreat to the end of the path where G was standing, and give two shots. Goodbye everyone, I hope Gregor will bring a frame for the Heroes of Might and Magic player from my bag.
Although, let's do it differently. In short...
Air shot at the golem + I climb onto the brown tile, from which I just climbed down (upwards). Second turn - I climb onto the harpy's corpse.
Golems turn.
My turn, I have 16 initiative - I go down to the brown tile, which is directly below the harpy's corpse, then I go down to the light tile even lower and give an (air) shot to the golem.
This is if the golem doesn't do anything too significant in its turn. I think I calculated everything correctly.