Alana and Marko are bloodlusted and trying to defend their baby Hazel. Jack O'Lantern and Quinn are intent on their goal of defeating Alana and Marko, but are in character and not bloodlusted.
The battle takes place in a cut-down cornfield in front of a castle (Hazel is inside the castle). They start 20' apart.
Alana has a standard laser pistol (not the Heartbreaker stun pistol she has in the comic).
Marko has his magic sword, and can also use his other magic abilities.
Jack O'Lantern is the classic Jason Macendale (pre-Hobgoblin), and has his wrist blasters, smoke and concussion bombs, body armor, and pogo platform.
Harley Quinn is New52 and has a sledgehammer.
Here are some scans of Marko's biggest fight scene, in the same bloodlusted mode he is in in this battle:
Who wins and why?