Why doesn't a puddle fall when it's raining?

No.14254303 ViewReplyOriginalReport
https://www.youtube.com/watch?v=m_2GgHEPLRo

it makes sense, if a raindrop merges with the another while falling (or even before falling), it could merge with another raindrop since it's bigger now, this could repeat itself extremelly quickly and made a puddle fall on top of a person or any object, so why doesn't this happen?