adjustment algorithm creates a vulnerability for a lo hash rate chain which we call chain death attack whereby someone comes in with large amounts of hash rate from somewhere else pushes the difficulty way way way up and then goes away and if you're in a situation where it takes 24 hours to find a block well that two-week period is actually measured in blocks so it becomes 2016 times 24 hours and that's not an ideal situation to be in but when you've got large amounts of transaction volume coming in and fee revenue it changes