ROLLING VXX SHORT CALLS

I currently have several VXX short call diagonals on, all of which have the September monthly as the back month, and with the short calls at the 16, 17, 18 and 21 strikes.

Today, with the 21, 18, and 17 short calls having lost a good deal of their value, I rolled them out to lock in profit as well as collect additional credit while I wait for a pop of some kind to peel them off ... .