As he fell, the other guard realized what was happening and got a shot of his own off.

When the guard realized that they were alone, he cleared his throat.

The guard suddenly realizes that his gun is gone.

The guards realized the gas attack wasn't working and turned their guns on the rebels.

By the time the guard realized his mistake it was too late.

The guard must have realized what he had in mind, because his mouth twisted with anger.

The platform had not been struck yet, but it was an obvious target, and the guards clearly realized that.

By the time the guard realized that he had been fooled, she was on the next floor and out of his sight.

The guard finally realized what was about to happen.

The guard doesn't realize that you, of course, have free access.