Yep, that HH lashing always holds ( for me ) and always releases easily, though freezing rain might add some difficulty. So does Speer's wrap or Hogn8ter's round turn with 2 half hitches. So does the Marine Nylon rope cleat, and usually I have no trouble with the cinch buckles, as long as there is at least a little slack ( after laying in it ) that I can pull towards the tree while loosening.
But I can see that frozen water might cause some difficulty with all of them.
YB, i have noticed that sometimes a slippery knot, if i just yank really fast, the bight will twist and then jam, then i have to pull the bight back and try again, but if i'm careful and pull slow, i can see the bight begin to twist all i have to do is hold it so it pulls straight and it always will pop fine. i havent tried any of this with the hh gear, so i don't know, but i suspect that the bight might have gotten twisted/kinked as you were trying to pull it through which might have caused it to jam.
I've been out lots of times when it was well below freezing at night, but this trip above freezing during the day & wet.
So that night everything froze hard.
I had to beat the ice out of knots to untie them, & I may have ended up cutting at least one.
Had to do the same to get the webbing on my pack to slide through the "Fastex Ladder Lock Buckles" too.
don`t leave the CREATOR out of the creation!