Sus much?

Red sus; I saw red vent; I saw red vent into electrical and kill blue in front of me, I don't think they were aware I was hidden in the corner; I saw the red 'crewmate' jump out of the dark hollow space called vents and kill blue crewmate, I walked in and saw them open the vent and crawl away, unaware of my presence, this leads me to believe that Red 'crewmate' is the imposter