[FONT=&]Do not get greedy. If you go into Battle Stance, be sure you have enough time to get back into Berserker for Whirlwind.[/FONT]
[FONT=&]Many bad things happen when you go into Battle Stance for Overpower, notice Blood Thirst coming off cooldown, cast Bloodthirst and be stuck with a lot of rage, unable to go into Berserker Stance to Whirlwind without wasting away all that rage into nothingness in the process. You gained some damage from performing overpower and refreshing Flurry, but you you also just burned 3 heroic strikes' worth of rage as taxes to enter [/FONT][FONT=&]B[/FONT][FONT=&]e[/FONT][FONT=&]r[/FONT][FONT=&]s[/FONT][FONT=&]e[/FONT][FONT=&]r[/FONT][FONT=&]k[/FONT][FONT=&]e[/FONT][FONT=&]r[/FONT][FONT=&]-[/FONT][FONT=&]S[/FONT][FONT=&]t[/FONT][FONT=&]a[/FONT][FONT=&]n[/FONT][FONT=&]c[/FONT][FONT=&]e[/FONT][FONT=&]-[/FONT][FONT=&]L[/FONT][FONT=&]a[/FONT][FONT=&]n[/FONT][FONT=&]d[/FONT][FONT=&], which is probably a net minus considering how hard HS can hit. Mine can do potentially 2k crits.[/FONT]
[FONT=&]Flurry is extremely important. White hits are half of your total dps, and a big part of that comes from the offhand, which directly fuels your Main Hand's heroic strikes, which in turn are negating the main hand's penalty from glancing blows, ultimately dealing big damage. It's all connected.[/FONT]