Any chance that's the terminal bud? I've seen some really strange ones and this year was no different. This was the top of one of my Cascade plants. The bud started to form and the vine just kept growing. Seen this a couple times but this was the longest one.
Terminal bud huh? Learn something new everyday. This is my first good harvest growing hops and this is on my second year cascade. Planted a bit late last year so I didn't really get to many bines so this year I just let them run wild to really establish the root system.