Secondly, there is an imbalance be

the strengths and weaknesses of the attacking and defending sides
A single "blackout" mechanism that changes the lighting situation can give the defending team a significant advantage. Firstly, the attacking team is in motion and the torch will reveal their position, secondly, the defending team has a night vision camera and although they will be able to switch between attacking and defending, whether they attack first or defending will have a big impact on the overall game. So with limited lighting conditions, the best thing for the attacking side is to have a 5 man synchronised attack, as we see in film and television, with 5 man squads watching different areas.