'surpassing human strength' would make sense if one believed the regular lies some yukkuri make about being able to defeat humans. If the Narrator/Storyteller is a Yukkuri (and thus falls for such lies), then such a statement would be understandable.
If you want to think about it this way... if yukkuris like these live long enough they can become youkai. So its completely possible that they can surpass human strenght.
It was mentioned in the original thread 'strength surpassing humans' it should have made a hole in marisa.
But shounen mangas have the hero surviving. This could have gone down the shounen manga path too. Especially with it surviving several seconds of free fall.