We've seen a lot more volume on big down moves than we have for up moves the past two months. However, the magnitude of that down volume is getting weak. Today we're on pace for about the same volume for this down move as we had last time (2018-06-22), but not much more than that.
I think that decrease in volume with falling prices is a key part of a bull wedge, and can be interpreted as the "bears" losing steam or confidence. Naturally there's someone on the other side of every trade, so that interpretation isn't perfect.