Halozyme Therapeutics Inc (HALO)

[friendofthedevil]

Perhaps this is an opportunity for me to understand something about these charts that has been confusing me.
You say, "Big buys coming in late today." but there was a dip in price with the increased last minute volume. I see the bars are blue. Does the blue indicate buying? And if so, considering every buyer is paired with a seller, can you give me an example of when and how a blue bar is assigned to a trade where the price dips? I don't understand these charts.

Thanks.