the combo movie showing it only at the corner.., if you are side by side like that it will work anywhere...
and it is practical. you do 2A > 5C > air combo.., since they will be falling down from that ice breaking...
also for xlxl, your FC doesnt work if it starts at the other corner of the screen, it works prolly midscreen, and the best FC is still in the corner you can do a longer corner loop for around 7k or so with max heat...
if you want it heatless prolly will be around 5k without oki