It's a fact that large companies manipulate their own falls in order to make even more money, but in this case the fall seemed chaotic and uncontrolled, so I don't think it was intentional.
Anyway, they probably see that even in the falls there is more money to be made and they will be using this fall to convince their shareholders to buy even more shares by convincing them that they will never be cheaper than now and that it will be a safe investment with the return of BTS next year.