It wasn't rare for hitmen to work in twos and threes.
Many people would be lacking in certain aspects, and could be third-rate when carrying out an operation on their own.
With suitable teammates, however, they could become top-class.
The type of difficult missions which first-class and third-class hitmen could complete were different, and the rewards they received were also very different.
Thus, even though it was hard for hitmen to trust others, many still chose to team up.
A hitman team like this was quite troublesome for Luke.
Most of these groups would have a lookout or someone in a supporting role.
This person would devote most of their energy to checking for flaws as well as taking note of unexpected situations and retreat routes.
This was a huge hindrance to Luke's crackdown.
After all, these people were all professionals with outstanding abilities and cautious and suspicious personalities.