Aslan had certainly been surprised upon hearing his mother call for him. He suspected initially perhaps she simply needed help with something, not that she had been considering going to answer the call at the borders. He knew little about politics and alpha responsibilities though he was certain that his father would have been perfectly capable of taking care of things.
There was no changing his mother's mind though and he was of course to go along for support. He didn't mind that quite so much, his mother certainly couldn't go alone after all though the boy still wished that she would have simply left this particular task to his father. There was no turning back now, they were here before the stranger. He'd never seen his mother greeting wolves at the borders, though the boy was certainly shocked to hear the rather blunt question sounding from her lips, no introductions or any kind of pleasantries. It was all rather cold in comparison to the usual warm and gentle personality he saw his mother with. With no need to speak and nothing of course to add, Aslan would simply stand at his mother's side as her silent guardian for now.