Alexander had originally planned to attack Lord Ponticus's flanking force in a head on charge, like he had done during the battle with Faziz.
But then thought better of it.
Because he figured the amount of time it would take for all the cavalry units to slowly do a 180 in this confined space would be too long.
So he came up with something better.
The grounds east of them were open and free, one where it was easy to turn one's horses.
So why not use all that empty space?
And Alexander decided to do just that.
But instead of relaying this order to all the units through word of mouth via heralds, for he knew it would take too long, Alexander simply decided to carry out the order by leading by example, using the horn and his standard to direct all the men's attention and have them follow him.
