Lessons to take from TWTR. First of all, I know from the past that TWTR is a fker. I've been burned before by weird option action. So remember: ROKU eats its young (flushes and reverses), but TWTR is a fker (options don't move right).
In this case, maybe because such a big gap, the option premium was soooo exaggerated that even when the price moved, the option calmed down and didn't move (or even decreased!).