For a mercenary, the MP5 is a personal defense weapon and is used by snipers as a secondary weapon; it's not about underestimating submachine guns, but rather they simply overlook them.
Machine guns, heavy machine guns, rocket mortars, those are the basic components of infantry firepower. Submachine guns are a bit better than pistols, but only slightly.
For an assassin, an MP5 is already an exceptionally heavy firepower.
Lucy was very content, although she didn't say it, the way she horizontally placed the MP5 on her lap and unconsciously caressed the body of the gun with her right hand, revealed how satisfied she felt at that moment.
When it's time to act, act. Eliminating Xinfeng doesn't require any special preparations, except that it's a bit time-sensitive; there's nothing else that needs much attention.
The coordination must be executed well.