@HarFrog, when I am on the boss level, sometimes the knight shoots the blade twice and sometimes it shoots it once. Is this random or does it depend on where you are located?

No idea! I had 1 game where the boss shot once but can't seem to replicate it

It's random! The boss will always attack normally on the first cycle and ground pound on the 3rd, but other than that it's a 25% chance for him to ground pound.