Blizzard versus Frozen Orb

[Obi2Kenobi]

You also didn't need to multiply it by 2 to begin with. If one attack does 100 damage in one second, and can be cast every 4 seconds, that's 25 max damage per second (ignoring cast rate for ease of calculation). If another attack does 50 damage over four seconds, and can be cast every two seconds, that's still 25 damage per second.