Background of John Wick
"John Wick, prior to being a hitman, served in the United States Marine Corps."
Relationship Between John Wick and Winston
One theory suggests that Winston may actually be John’s father-in-law.
Excommunication of John Wick
As a consequence of killing Santino on Continental grounds, Winston declares John "excommunicado", terminating all his access and privileges to underworld resources.
Baba Yaga in Russian Folklore
Baba Yaga, in Slavic folklore, is an ogress who steals, cooks, and eats her victims.