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To that I would add it gives them time to observe the scene and mentally begin work. It's not the same in seriousness, but when I was to solve an urgent IT problem I'd sit down, adjust the monitor, and roll up my sleeves before typing anything. And recently, when my baby son was falling down some stairs, I found myself calmly walking to the stairs and catching him right before he would have landed on his face. Looking back, I wondered why I didn't run since I love my son, but I realized that I might have slipped on the tile floor or dropped him in my haste.