With the guards who were inside the corridor following his two Yin Puppets, Bai Long was forced to multi-task if he wanted to find out what was inside the corridor, and didn't want his Yin Puppets to get caught or die.
This was because, if Bai Long's Yin Puppets die, before he could destroy the communication between them, the market on their forehead would remain.
When that happens, even though it wouldn't be linked back to Bai Long immediately, any news leaked about the symbol could cause a problem for him in the future.
Therefore, unless he had no choice, Bai Long didn't want his Yin Puppets to die while he still hadn't erased the connection between them, which destroyed the symbol on his forehead.
But, if he destroyed the connection, and the man didn't die, that would be a much bigger problem, since he would obviously reveal details regarding Bai Long being bring everything.
