Staying outside to keep watch and to respond signified something that Liu Weiguo was very aware of; it meant he couldn't engage in battle with the main forces of Blood Wolf. In his view, Wang Yu's arrangement was designed to ensure his safety.
For the success of the mission, Xiao Mei, regardless of her personal safety, volunteered to distract the Blood Wolf guards to provide the team an opportunity to approach the villa. As a man, how could he possibly hide behind?
Setting aside that point, his purpose in coming to Canberra was to fight, to join Wang Yu and the others in exterminating Blood Wolf. Now that Wang Yu was assigning him to keep watch and respond, he naturally couldn't accept this decision.
"Wang Yu, I strongly oppose your arrangement!" Liu Weiguo said to Wang Yu with a stern face, his attitude firm.
Wang Yu knew him too well, so the moment he stood up to object, Wang Yu already understood the reason for his opposition.