For the sake of security, the position by the back door of the clinic was always guarded whenever Ding Lei-hak was inside. It was a measure to guard against any eventuality.
If trouble were to arise, those guarding the back door could provide timely support or facilitate his escape. After the incidents involving his second brother, Ding Wong-hak, and third brother, Ding Yik-hak, the deeply suspicious Ding Lei-hak had become hyper-vigilant about his own safety. Aside from when he was at home, he ensured that dozens of elite henchmen were with him at all times.
These men were all armed and highly skilled. Crucially, the vast majority were loyalists he controlled through the use of "Four Guys" (a type of narcotic). Because they were dependent on their daily supply, they would gladly stop bullets for him; describing them as half-suicidal was no exaggeration.
Chapter 443