Question about the harry potter and the deathly hallows part 2 trailer (SPOILER ALERT)?

in the trailer, there is a big tsunami created in the chamber of secrets. do you think that tsunami is caused by hufflepuffs cup when it see's its about to be destroyed by the basilisk fang (like the locket tried to drown harry when he was about to grab the sword), or do you think the tsunami was inside the cup and when ever the cup was destroyed, it escaped?