I just knew she would leave the aisle and it would make Kanon anxious when she came back! I mean, of course it would!
Do people really separate to pay for things like this? Usually if I’m with a friend and they go to buy something I’ll stand with them to chat, even if I’m not buying anything. If it was a family member maybe but not a friend
Even though I understand what you mean, there have definitely been times when I was just looking around, while my friend was at the counter (or the other way around), so it's not really such an outlandish or manga-only incident XD
But Saki could have been paying a bit more attention to whether Kanon had finished her purchase (and definitely not leaving), since Kanon would have a hard time spotting her in the midst of a crowd.