Why don't you skip the line of the soldier speaking after Grinko? I've noticed that skipping the Grinko line crashes the game when you quicksave and quickload again, but if you just skip the soldier's line it works just fine.

I've seen a video of Distro's theorizing a Goa skip, by clipping through the elevator. If this is still relevant, I managed to find a consistent way of doing it, but I don't exactly understand its use. All one has to do is running a bit forward then sticking to the left with the gun pulled out, holding W and A.