During the first file (Named "Counter-Strike Source 2019-11-10 12-18-03.mp4".) we don't see any players trying to get up to them from the box up the letters, so I don't know who you are talking about when you said he was blocking by looking in a different direction as we can also see on the radar/map that nobody was near the crate/box that they would have to initially get up before they could get to the letter he was standing on for some time so how could he have been blocking anyone when there was nobody on the box/crate?
Second file (Named "Counter-Strike Source 2019-11-10 12-19-28.mp4".):
"he immediately start fall back because he was afraid to get infected"
Wrong. You can see that as soon as his former teammate got infected he begins shooting him while not moving an inch, but due to the player already standing too close to him he also gets infected even though he managed to hit the zombie a few times. Once infected he turns around 180 degrees and then tries to go for the remaining humans before getting shot back to the crate/box and the video stops.
"I didn't record when he was actually teamkilling"
I'm obviously not going to issue any punishment on pure accusations without any valid evidence/proof of said incident.