Those videos are not belong to me, it belongs to the other channel who uploaded.

Among Us roles hint:

Crewmate Role:
Enginner A crewmate can use vents like the impostor, They can hide there to find or catch the impostors who venting. You cannot stay there forever or the crewmate think your an impostor.
Scientist They can check vitals anytime they want to, to refill battery, need to do some task, they can check if the one of the crewmates is dead.
Guardian Angel When you died by the Impostor, you can protect the other remaining crewmates from the impostor to not make them die (You only have to protect one crewmate and there will be a cool down)

Impostor Role:
Shapeshifter They can disguise mophing into other crewmates to make someone suspicious and innocent.