The Interrogator, the man who brutally tortures Axon Rey, is portrayed by Zvonimir Lucic who was Mirko Filipovic's manager at the time.
Many of the people used in the action sequences of the film were former team members or (as of time of filming) members of the Luko Anti-Terrorist Unit; which Mirco was once a part of. By using them in the film they used live ammo in some parts of the film safely.
Mirco stated that the long hours of filming as long as 12 hours a day, was a different and unusual process for him.