Black Widow and Hawkeye argued over which one of the two would help Captain America, until Falcon appeared with the orders for the two to hold off the Super-Adaptoid while he called Iron Man, to which Black Widow ordered him not to.
Chicken's blood stone is a rock, rather than a mineral, that is composed of dickite; a polymorph of kaolinite, and quartz. It also has a variable amount of cinnabar, which gives it a distinctive vivid red color.
Blood Shards (AKA Shards or BS) are a form of currency introduced in Reaper of Souls. Shards' only use is to gamble on items with the NPC Kadala.