It also occurs for just a moment whenever entering combat to give the UI time to react to being in combat. Showing target frame, a hidden actionbar, [combat] macros, etc.
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"You'd be surprised how many people violate this simple principle every day of their lives and try to fit square pegs into round holes, ignoring the clear reality that Things Are As They Are." -Benjamin Hoff, The Tao of Pooh
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