Yep, never underestimate ice. Tho in a old building like that you could as well just use a brick roof tile and nobody would suspect a thing. Or unscrew the ladder beforehand, so it falls backwards. Bang cracking the goatfuckers skull wide open towards the pavement.

Heck take the glowing iron stick from your fire place and burn that fucker right in his face. A spray bottle with home made chili spray would be guaranteed to blind the goatfucker, 10x more efficient than pepper spray and 100% legal as long as it's home made. Or just acid in a plastic spray bottle would work just fine.

Some axe deoderant and a lighter makes a great Flammenverfer, only $2 and fully legal.

Or connect + and - from your non grounded outlets directly to the metal ladder and the goatfucker flies off from the shock, or he'll get stuck and fried on that ladder.

Baseball bats always works, just be sure to keep a ball nearby to make it legal.

Or get a hunting loicense, it's literally just a weekend course, then you can blow that fuckers head off with an AK-47 or AR-15.

Yep, never underestimate ice. Tho in a old building like that you could as well just use a brick roof tile and nobody would suspect a thing.