[It's a bit odd. But although Aang might have learned some of Soren's fighting prowess through Ikki, he so far doesn't have any reason to think Soren isn't being kept like a normal pet by Ikki. So he walks over and gives another wave to Soren, patting Ikki's shoulder as he passes her.]
october 4th Aang->Masaomi->Ikki->Katara
Hi, Soren! It's nice to meet you.