Ambushing

About
Ambushing is a tactic in which the enemy is ambushed and eliminated. There are multiple types of ambushing. This tactic is most common on the City map due to the nature of the map. This tactic involves "Swimming", an important part of hiding yourself when preparing an ambush. Although the instructions for doing it are only provide for the City map, this tactic is theoretically possible in all maps.

How to Do it in the City Map
First, you must swim underwater. Do this in manner so as to let the commonly used passages still visible on your screen. This is the part which requires speed. Once the enemy is in sight, but has just passed the opening in which you will plan to go through for the ambush, quickly pounce behind them and eliminate them rapidly (less than a second).

Avoiding Potential Ambushes
To avoid an ambush, simply swim yourself and be extremely cautious while traveling on commonly used passages. Vigilance is essential.