There are three possible states to this system:
Long - Shorts are not options here.
Neutral - No position, a watch the market only situation.
Short - Longs are not options here.
The current state is Long.
If one decides to exit at EOD and the state remains, for example, Long, the following AM there is the option to reenter the market at a favorable time.
There are times in a particular state when it is opportune to add to positions. The second buy today at 28.05 is an example of such an event.