Just as a point of clarification since I have seen this come up:
A spell, gas, etc. packet will count if it hits the face. However an arrow packet that hits the face does NOT count.
ARB p.94:
Packet attacks include spells, gas globes, and certain monster abilities. Note that unlike the weapon rules, a packet attack will count if it hits “nonlegal targets” such as the head or groin—but that’s not to say you should aim at these illegal targets. The only exception is archery packets, which follow weapons rules.
A spell, gas, etc. packet will count if it hits the face. However an arrow packet that hits the face does NOT count.
ARB p.94:
Packet attacks include spells, gas globes, and certain monster abilities. Note that unlike the weapon rules, a packet attack will count if it hits “nonlegal targets” such as the head or groin—but that’s not to say you should aim at these illegal targets. The only exception is archery packets, which follow weapons rules.