Grim Fenris was reading about a specific page in the Tamer's Book left to him by his grandfather.
He read that the 'Vestri' family was the second most elite royal family in the elven regality. Second only to the Fenris family.
While Grim was working on his part time job as a waiter in a nearby eatery, he still had his backpack on him at all times.
He figured the looks he got as to why he was carrying a backpack would be much better to deal with than risking Dart showing himself in the streets of Midgard.
Plus, he had to keep his partner safe, if Spade were to ever show up once again and be out for both of their blood and settled for Dart's, he would be in trouble along with the little dragon.
The anxiety that the elven boy felt as he kept looking over his shoulders was no laughing matter at all.
And even Dart knew how grave the situation was. This was the first time that he was not cracking any jokes at all.