Liang Qu told the four beasts to stay put and not to move, while he picked up Fubo and, along with Might, slipped closer to check things out.
When Ze Spirit was still a Water Monkey, most fish wouldn't notice him as long as they didn't make eye contact—even if he was as close as two meters. This was even more the case once he turned into Ze Rong.
Even if the sprite monsters were sensitive to the presence of others, a range of three Zhang was a safe distance for Liang Qu.
Might had a racial talent, curling up motionless, indistinguishable from a lifeless object, and could even conceal his presence better than Liang Qu.
In comparison, the four beasts were much inferior, and their large size made them likely to be exposed if they got too close.