Stuck on modelling tutorial

Hi, I am trying to follow a head modelling tutorial here:

I have followed all the way to 19.00 where the guy selects 2 x single vertex points on the eyelid and pulls them out, now when I do this I select the 2 vertex points but when i hit G to pull the eyelids pull forward and the whole head behind it pulls out too even though it doesn’t look as if it is selected, if anyone could take a look I would be most grateful.

Thanks In Advance

Hi, for those interested after a lot of searching I have solved this puzzle, it was doing this because proportional editing was on, after toggling it with the O key everything worked fine…