Random Floating Cold Striders

I was just walking through the nether towards my local piglin bastion when i saw a peculiar sight; there where at least 4 striders that where floating and chilling (in both ways of the word) they were moving  but even though they where hovering above the lava they where cold. And so far i couldn't see any babys' that they where riding

Oh and it would be very cool to add crimson boats that can sail in lava. i just had that thought and it'll be sick.

 

Thanks ,