Regarding lasers, yes you are right about not being able to dodge a laser at the speed of light and yes lasers would not have a start and end point. However, you can dodge someone's aim. And a faster traveling bullet (or laser) doesn't immediately make you a marksman. Which is why it's possible to make yourself a hard target in real life against something that travels at the speed of sound, which is marginally easier that dodging the speed of light.
Finally, regarding Shape shifting aliens that are human sized then changing into a rat. You assume that alien isn't mostly hollow when they are human shaped.
Regarding lasers, yes you are right about not being able to dodge a laser at the speed of light and yes lasers would not have a start and end point. However, you can dodge someone's aim. And a faster traveling bullet (or laser) doesn't immediately make you a marksman. Which is why it's possible to make yourself a hard target in real life against something that travels at the speed of sound, which is marginally easier that dodging the speed of light.
Finally, regarding Shape shifting aliens that are human sized then changing into a rat. You assume that alien isn't mostly hollow when they are human shaped.