Fortunately, Salvatore did not leave immediately after dropping the letter.
After all, as soon as he received the letter from Black Tower, he began writing to Annan. Only after sending out the letter did he start packing his own luggage... especially the materials, potions, and utensils in the basement.
As a result, before Salvatore could finish packing, Annan had already rushed back to Frostwater Harbor.
"Being so close, couldn't you have just called me back instead of writing a letter?"
Annan spoke irritably, "What's the point of a letter..."
"I was just worried you might be busy," Salvatore said with a sheepish smile. "What if, after receiving my verbal message, you couldn't rush back in time... That would just be wasting time."
—In reality, he had mostly forgotten.
Since his own daily work was tightly scheduled, he subconsciously assumed Annan must also be too busy to leave his post...