Justice League Dark finds themselves in Rowlingverse London where their powers still work. The Wizards and Justice League Dark have suddenly become aware of each other.
Voldemort sends Snape to bring in John Constantine for questioning. Snape has no choice but to obey.
John has been learning about the wizards and notices Snape following him as he goes out to get cigarettes from a department store. He is not sure whether Snape is good or evil and views him with suspicion.
Who captues whom? No death or grave injury. Victory will be achieved when one captures the other for questioning.