After agent Armstrong explains to Tyler the effects that his trip into space had on his body, he shoots the ship, thereby critically damaging it, before revealing himself to be a reptile-like alien in disguise and captures Tyler.
After agent Armstrong explains to Tyler the effects that his trip into space had on his body, he shoots the ship critically damaging it. This is before revealing himself to be a reptile-like alien in disguise and captures Tyler. This is thereby.