tcp match silently drops packets

[JC]

> For the exact same reason the match also hotdrops fragments which would
> overwrite the TCP header.
>
> In theory just the second criteria is a must (drop fragments which could
> override an earlier decision), but as it's there the first also makes
> sense to drop the first as we can not allow a fragment filling in the
> missing pieces.

Could someone please explain these two?