Upon resumption from a halt, a stock may experience an initial sharp drop ('big flush') due to panic selling, followed by a quick rebound ('rip') as informed traders buy into the dip.
"sometimes we will actually see that when the stock resumes it has a big flush which is caused by all the people whose sell orders go through and then it rips right back up as the smarter traders who know what's going on anticipate that initial panic and then the squeeze back up which is one of the ways that I like to trade these it's called the dip and then the rip"