Actually FA LAAM KAAF, in its root meaning is also used for the waves of the ocean precisely how it is used in the following verse 36:41.
Saabiq = SEEN BAA QAAF
Outstrip or precede or before or hasten or win … all meanings relative to the case where one attempts to precede another for winning or any other cause.
So its more like the night cannot beat the day to its ordained time. Either one has its ORBIT (we haven’t yet concluded to what meaning this carries), so there really is no competition between the two where one outstrips the other. They progress along their orbits according to their ordained times.
Will get to TUDRIK after some research. Though one thing of interest is that there is a hadith in Bukhari about verse 36:38 in the Book of Tafsir. Why don’t you read it and see what you understand from it. It has me equally confused.