Toz, with his perception, noticed how two people left the guild with less than happy faces but didn't think anything of it. Jealousy was a natural feeling, and people exiting a building was even more natural.
After getting his money from Rick, he also left the building, and the cats, who usually were in the familiar space when he was in the city, left it and climbed on top of him, taking their usual places on his head and both his shoulders.
They had just made significant progress in their quest to accumulate enough gold to purchase a grimoire, so it was naturally time to celebrate, and the cats didn't want to wait until they reached the room. During their time in the city, they had also noticed other people with very strange spirit beasts so they weren't that worried about Mindle catching the attention of someone with nefarious purposes due to her appearance.