Vex don't turn their head to look at their targets when aggro

The Bug:

When Vex are locked on to a target and circling it, or when charging at their target ready to deal damage, they do not turn their head to look directly at what they're attacking like other mobs do when aggro. Their head movement remains idle; they can even look at other mobs while charging at a player or different target. Most other hostile mobs look directly at what they're attacking.

This was an issue even before the Vex model change.

Steps to Reproduce:

1. Summon a Vex and get within its aggro range. Notice how even though it is locked on to you, it will not turn its head to look at you directly, its head remains idle, and it can look at other mobs while doing this

2. Wait for it to charge at you, and notice how still its head is idle and does not face you; it may instead idly look at you if in range like any mob does