He didn't detect the actual attack, he quite honestly only detected you stopping. we can cancel out the latest charge, if you'd like - however - to move past this.
You have to make some sort of sacrifice, because in reality there would be no complete dodge of an attack like mine at our tier, I never actually stated that Adrian stopped in order to fire my post ended with Adrian shooting his bow, there was no mention of him ending his previous action of chasing after Alphonse, considering the speed of an arrow its highly likely Adrian's next action would be dependant on the result of his attack, so he had no reason to stop, especially as firing an arrow accurately at that distance would be easy even for a human when running around.