Episode One question

[riventhorn]

 Question about Episode One and why eating dried fish gives Lin Jing a clue.

We see Lin Jing in his lab looking at something under the microscope--presumably from the crime scene where Lu Ruomei died. When he eats the dried fish, he says "fish" and this apparently gives him the clue he is looking for. Da Qing later calls ZYL and tells him they have a lead, and they head to the abandoned building, presumably expecting to find the shadow-Dixingren there, where Lin Jing once again scrapes something from the wall. 

So--why does "fish" give Lin Jing the clue he needs? How do they know to go to the abandoned building? What am I missing? 

Comments

[solo]

I didn't get the impression that he got a clue from the fish... only that Zhu Hong got him munching on it, and then it dawned on him that this was Da Qing's fish he was eating and he got a bit terrified?

I may be wrong!

[riventhorn]

He does have that realization, but then it seems like he has a second lightbulb moment related to what he is researching and gets all excited.