Buy strong companies after they have a dip because of bad earnings qt.
This is a viable strategy, and followed by many value investors. There is also plenty of evidence that has proven that markets tend to over-react to even slightly negative news. You can have a GOOD earnings call, but just because the target was off by a penny from what some big bank predicted, holders tend to cause brief sell-offs first, then ask and re-evaluate their move later.
This over-reaction is one of the many arguments that was used to disprove EMH.
It's one of the big advantages also to the 'little guy'. You can exploit this quicker and at better price targets than the bigger guy. Even when the 'Big Guy' starts to dump or trim off stock ahead of anyone else, he can't dump the stock at the target he wants because he will be dropping his ask-price as he sells it off.