I had an experience two years ago where I let the downhaul go slack while flying the chute, and it wrapped around the anti-halyard-wrap collar at the top of the genoa roller furler and got a loop hooked. That prevented me from lowering the chute with or without the sock. The spinnaker couldn't have been lowered even if I had cut the halyard. Fortunately I had plenty of sea room while I figured out I could hook a spare halyard shackle over the downhaul line (with retrieval line attached), and slide the spare halyard shackle up high enough to lift off that loop from the snag -- then pull it all back down.

If it had been dark out I wouldn't have been able to diagnose the problem (binos helped too) and without the spare halyard I would have had to drop the main while going downwind with chute up, and it was great that I wasn't close to a lee shore.... so things could have been worse and the final resolution turned out to be serendipity.

The lesson to be learned: Don't let the ATN sock downhaul whip around loose. Tie it taught near deck level to keep it in control.