Very glad you caught it in time and were able to save your bird!
I had one chicken that took several weeks to get the hang of horizontal nipples (crossbeak, aiming is not her strong suit) so I've always advocated giving each individual bird attention when training to nipples. That might be impossible with a very large flock, but with 9 birds, it's much more doable to check and track each one to make sure they're able to toggle and drink properly.
I had one chicken that took several weeks to get the hang of horizontal nipples (crossbeak, aiming is not her strong suit) so I've always advocated giving each individual bird attention when training to nipples. That might be impossible with a very large flock, but with 9 birds, it's much more doable to check and track each one to make sure they're able to toggle and drink properly.