Visible crew/equipment: When Kitana, Lui, and Johnny are heading towards the Black tower in Outworld, or when Kitana is explaining that Outworld used to be a beautiful place (same time) there is an overhead shot and you can see the shadow of a man on a wall holding a boom microphone.
Visible crew/equipment: Where Shang Tsung kidnaps Sonya and takes her to outworld, you can see the green markers used for camera positions, lighting plans, or actors' marks on the floor.
Answer: Since the entire fight is focused on Liu Kang and Reptile, he could have possibly waited to see what the outcome of the fight was.