sentences:  Vision modes include thermal vision, which allows Alex to see enemies through smoke and other obstacles at the expense of a decreased vision range, and Infected vision, which highlights those infected with the BLACKLIGHT virus as well as military units.Both vision modes muffle all of Alex's other senses, such as hearing, in order to concentrate on his sight.One defensive and offensive power may be active at a time, and using either will negate Alex's current disguise.