It sounds like Grey is becoming interested in Honey. Hissing, swatting, and growling are all ways of communicating. If he's not hurting himself by banging into the door let him get close. Hopefully he'll get a sniff and decide he's more interested than scared in a few days or a week. Maybe then you can advance to baby gate or door cracked enough to sniff noses or clawless swats.
If he does get worked up do what you did the first time, coax him away or get in his eye site. Touching, even gently, or lifting him could upset him more.
It does sound like the intro is moving forward. Let yourself relax.
If he does get worked up do what you did the first time, coax him away or get in his eye site. Touching, even gently, or lifting him could upset him more.
It does sound like the intro is moving forward. Let yourself relax.