Need help understanding instant-hit lasers

Can someone help me understand the logic behind making a laser that hits instantly I believe its called hit scanning or something like that. I've tryd implementing whats in this example but idk, I just cant wrap my head around it...

scirra.com/arcade/example/1853/laser-gun-effect

this is what i have so far:

puu.sh/6JiBM.png

puu.sh/6JiDg.png

Post a capx.

If you have link issues, just post a link and place a space in the http ref like:   ht tp://link.com

Oh sorry yeah that makes sense. Here's the capx

https://===www.dropbox.com/s/yghgxr86b6z8efg/===Spaceshooterrrrrrr.capx

remove the ===

Atm, your capx is experience this issue

edit: submitted in the bug thread

Seems Ashley is on it already concerning the bug.

I'm not installing the previous construct 2, sorry for that, so I cant be of help till the next release.

Oh no problem you already took the time to help. I don't really understand what the bug is could you explain it to me in simple terms if thats possible. Sorry i'm still new at this.