those are some dangerous stairs

They clearly should put some warning signs so people can be told about the stairs so this doesn't keep happening.

I am greatly reminded of Family Guy, the one where Peter even if he slowly moves down said stairs drops like it was lubed with oil.

In Soviet Russia, stairs break Flandre!

Two someones apparently forgot that they can just fly.

Looks like Sakuya has been messing with her powers to manipulate space and time.

I WARNED YOU ABOUT THE STAIRS, BRO! I TOLD YOU DAWG!