I'd like to note that I'm prone to panic attacks. Most inconvenient part about them is you have to deal with them as they happen or they eat you alive, and it's almost impossible to know when your next attack is. With that in mind, these methods are designed to be mixed and matched to suit any situation. So although taking the last few minutes to turn the water cold does the same thing as splashing your face, you're not going to always have access to a shower, nor are you going to always have the time to take a shower of any length.