(That's perfectly fine. The best canon users are ones who can use their reasonable discretion to change the principles of basic jutsus without doing something illegal. Best way is to try it for yourself xd)(though I'm not sure if it would be illegal in the RP to alter the technique like that or not).
"You would likely react to the handseal or the sinking; use a fully-body surge technique to try and dispel the sinking sensation or defend yourself. I feel the Nagashi would be nearly perfect for this. In any case, half the battle against genjutsu is figuring out how to break out of it and deduce its properties. I think you're quite proficient at this point, though."What would be a better way to escape this one?
Sensei would simply metagame out of the genjutsu.As Souji blinked, Rentaro formed a single handseal and sent him into a world of darkness!
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U_U
"And with that, you're done. You've grown quite a bit, Rentaro. If you have any more questions, you know where to find me, right?"
Souji offered his hand in a Seal of Reconciliation to conclude the training session.