use /flamestrike to automatically alternate between rank 6 and 5 of flamestrike. If at least 4 seconds have passed since your last rank 6 that will be used, otherwise it will use rank 5.
Here is a sample macro
#showtooltip Flamestrike
/flamestrike
Manages switching between rank 6 and rank 5 of flamestrike
use /flamestrike to automatically alternate between rank 6 and 5 of flamestrike. If at least 4 seconds have passed since your last rank 6 that will be used, otherwise it will use rank 5.
Here is a sample macro
#showtooltip Flamestrike
/flamestrike
Manages switching between rank 6 and rank 5 of flamestrike