Blood vial

Upon seeing that I had calmed down, Bane reached out for the inner pocket of his coat. He did not answer me immediately, but he handed me a small cylindrical glass vial. "Here, this is my blood, have it." 

I grabbed it while I eyed it with obvious confusion, "you carry your blood around like this?" It was so odd to just carry it around like water and offer it like water. My eyes went over the vial disturbed and then back at Bane. Did he actually have more than one of these? Besides, why exactly did he even carry them?

"Yeah," Bane replied, "if there is an emergency, I prefer this to cutting myself." 

"That's smart," I said as I twirled the vial around. It had a cute, tiny cork on it with a skull symbol on top. "You did not answer my question, though." 

"Drink that first-"