Physical strength and technique are not the only skills you need as a security guard. You also need to know about your surrounds and be able to act on snap decisions based on these surroundings.
Make sure to check the map often to grasp the situation you're in and have the guts and gumption to act on your decisions. Actually. One of the skills you need as a security guard can be performed by pushing the X button while "Aiming"...
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