A plan that kills two birds with one stone

Half an hour later.
When Reuben Su returned to the Jishi Clinic, he saw two young men in plain clothes lying in the inner room with their hands and feet tied.
Next to them was a backpack.
"what happened?"
Reuben Su glanced at these people and asked Chen Feng.
"These two guys used the excuse of buying medicine to secretly place an explosive pack in the clinic. I caught them on the spot!"
Carl Chen explained as he opened the backpack on the ground.
There was actually a bag...