Litaphorically

Here is a passage that I will explain literally and metaphrically.

"Between moves they tip their heads back, swirl blood-colored brandy in glass globes and watch it crawl down the curved glass in liquid veins."
So here is the literal setting, these two men are sitting in this room talking and strategizing about the soon to be murder of Lumumba. While talking, they sit back and swirl their red wine in their wine glasses, and after sipping, watch the wine on the side of the glass suck back to the bottom in a vein pattern.

Metaphorically: Between talking and strategizing the killing of Patrice Lumumba, they lean back and think in their transparent glass brains about the blood of Patrice Lumumba, swirling with different ideas on how to execute the process of the murder. They see these different execution options in their mind and see them all play out as the blood thoughts finally settle in their minds blood veins.