@Arbutus: Perhaps the Cyberman gun has various settings for range and what it is shooting at, and that makes the ray vary.

If I had been designing flying Cybermen, I would have likely given them backpack jetpacks rather than built into their lower legs.

At the end Brigadier Lethbridge-Stewart, reincarnated as a Cyberman but still apparently with his human mind and feelings, flies up into the sky. I wonder if he will be seen again in a future series.