It a regular school morning, where Dronacharya was readying to teach his students the dynamics of an arrow when hitting an underwater target. This wasn't a theoretical lesson. That is why they were doing this by the riverbank. The Guru was waist-deep in the water explaining the impact of water on the velocity of the arrow. The students all stood by listening patiently. Some of them were bored of course. Naturally when you teach over a hundred children all at once, some of them miss the courtside view.
Just then something happened. Dronacharya's monotonous drawl took on an interesting turn. "Let's label the angle of incidence of the arrow on the water surface as theta. Now, ignoring any ripples on the water, like this very big one here… OUCH! HELP, a Crocodile has got my leg. HELP ME!"
Some of the backbencher Kauravs thought it was part of the program and continued being bored. The ones in the front though could clearly see that their guru was right. There was a massive Crocodile and it had indeed grabbed Dronacharya by the thigh. Some of the princes screamed and ran around confused. Some of them were trying to avoid other crocodiles that must surely be around. Others, like Yudhishthir were shocked at seeing their Guru in this position.