Okay.^^
Chelsea scans the area around her, trying to notice if something is coming towards her, as she sees that everything has become silent.
She then sees some feathers falling down from the sky, which are pretty large in numbers.
She also notices the feather started coming after her sensei waved the handseal, indicating that it is his doing, alongside the fact there is absolutely no possibility that a group of words to throw feathers can appear out of nowhere.o.o
Also, the man never drew out blood or put his hand on the ground, so as to summon a bird or something and there wasn't any summon that actually appeared. So, that made one thing clear to her, this isn't summoning ninjutsu. Also, the feathers weren't directly directed towards her vital points to harm her, but had soothing effect attached to them rather than the killing intention which jutsu like this is supposed to have attached to it.
This analysis made one thing clear to her, this can not be a ninjutsu, effects are more psychological as well and there was only one thing that was coming to her mind, it is genjutsu.
After figuring out, she is in genjutsu, she made one handseal and focused her attention on her chakra flow. Due to that, she was able to sense the movement of every bit of chakra flowing through her. She then forcefully stopped the chakra from a moment and then restarted it in a quick succession, so as to reset her chakra flow. This spike was powerful enough to release her out of genjutsu, due to a genjutsu release technique, which she called out while performing, known as 'Kai'.
It was a really good genjutsu though, she waited patiently for you to respond.