Half-open mouth threat and lunge
Half-open mouth: The mouth is slightly open with corners drawn back, the lower lip may be retracted and the teeth are partly visible. This display is accompanied by staring. It is occasionally silent but is most often accompanied by the rattle vocalization. This expresssion is associated with aggression.
Lunge (at 0:05 and 0:10): An individual performs a jump or short run toward another, generally inducing an agonistic response in it. This behavior is associated to other aggressive patterns
Thierry, B., EL, B., Baker, S., Matsumura, S., Muroyama, Y., TG O, B., ... & Watanabe, K. (2000). The social repertoire of Sulawesi macaques. Primate Research, 16(3), 203-226.