Hugh
"Aim the projectile upward, and try to catch it the best I can as it falls, okay, okay." She said as she had began to weave seals, and then began to churn the chakra within her. With that, she shot out a more manageable ball of water, and it went directly upwards. Though, she wondered HOW exactly she was going to catch it, she didn't have any Elemental Seals ready for water! She quickly got out a bit of paper and scrambled the Fuuinjutsu formula onto it, with that, she held it up but the water hit against it and splashed all over the paper and a bit of her.

". . Let me just, practise this seal for a bit." She said as she began to make up a new formula for the Fuuinjutsu seal, it should be the exact same as the Wind Release one! And the Earth Release one, as well as all the other ones! Maybe she just didn't fine tune it to the density of chakra that Water Release had. Wind Release doesn't need as much chakra to use internally than Water Release, at least during it's early stages of development that is.

"Okay, one more time, I promise I'll get it this time!"
Christopher
Where fuuinjutsu was involved, Hibiki was quick to assist. A quick drip into her sash retrieved her book of seals, and from it, she unsealed a separate tag. That revealed the formula for her to copy. As Iyana likely suspected, the core was the same at the elemental seals she'd already learned, but a glance would reveal differences in the outer lining. Compared to a force as rigid as earth, the water seal was made up of waves – flowing lines gently interlocking to bind a piece of nature.

She held it up for the girl to observe, and hopefully save herself the hours Hibiki had spent trying to stubbornly draft it herself. "Take your time. Even by shinobi standards, seals are stubborn beasts. Fortunately, I have struggled so you won't have to. One of the benefits of not being the first to learn a skill."
Hugh
"Thank you very much Senju-san."

She bowed her head down, a bit of water dripping down on the ground. With that, she began to copy down the formula, but as she did, she had done it again, and again, just to remember it in her mind. "Okay, I remembered it. Now, let's do this." She said to herself as she weaved the seals, conjuring up a large amount of Water Release within her body, with that, she expelled it, spitting out a decent sized water-orb into the air. Then, she quickly moved.

She raised the seal up, and a bright blue glow revealed the water was in fact being sealed into the seal. She grinned, and then held up the seal in glory. She then held it with both hands and looked towards the Senju yet again. Bowing one last time. "Thank you again Senju-san. Though, I have to ask, who taught you Fuuinjutsu? Surely they had to be great in it for you to be this good, or are you self-taught?"
Christopher
The water was troublesome, and called for a few awkward sidesteps, but the jutsu was nothing that nature wouldn't dry within hours... Especially if their training went to plan. Hibiki observed the girl's final test – firing one jutsu, and then using the other to send it away. It went surprisingly well for something she'd made up on the fly, and had little hope of succeeding. All that was left for her was to show her satisfied smile, as if she'd known the success would come quickly. "Good work, Iyana. We may make an expert out of you yet." She asked of her teacher – a surprisingly rare question, and one that earned an intrigued eyebrow from her.

"There are many areas I can say I'm self-taught in... But the seals aren't one of them. For those, I have Tokugawa Minori to thank. No doubt, he is still the better artist of us two, but... I'd like to think that I'm getting there." The confidence stayed on her face long after she tucked away her scroll. "That's all for today. Keep practicing your sealwork, so you won't have to hesitate when it matters most. Until next time." It didn't take long for her to turn and reach the door disappearing around a corner shortly after.