CVG recently had a chance to play through a little bit of the driving sequence in Episode 2 during a recent visit. Here's a little of what they had to say about their first encounter with a Hunter.
Pretty soon after this, the Hunter was firing its sticky, explosive ordnance at me. Glowing blue darts fire in sets of threes, sticking to the surfaces around my hiding spot and exploding shortly thereafter. This sort of weapon forces you to keep moving - and the Hunter takes some beating before it finally swoons.The preview isn't long, but it details a bit about the reactions of Alyx and the behavior of the Hunters.