Since Living Bomb can be cast over it's self (and thus delaying the explosion @ the end) wouldn't these macro's simply recast Living Bomb WAY more often than necessary?

I see it casting scorch (Line 1),scorch (Line 1),scorch (Line 1),scorch (Line 1), living bomb (Line 3), scorch(Line 2),living bomb(Line 3),ffb(Line 2),living bomb(Line 3),FFB(Line 2),etc...

Is there a mechanic here I'm not aware of?