This is how did i get my Anzu mount without assistance of anyone else's druid.
First at all, im impressed becouse i didn't find any posts about this.. its so simple. Also, i can't judge if this is a exploit or not, but many people doesn't know about this and keep asking me in-game. I just want to contribute.
How it works:
Summoning to a friend method (or seeling its summon to a player).
1. Have an alt druid (pref. lv 80) or be a druid.
2. Invite a player you want to give instance lock with Anzu.
3. Go Stealth. Summon Anzu, no trash clear needed and 1st boss is skippable. Before Anzu appears, go to a corner. Anzu will stay there.
4. It's important to leave the instance or logout after you clear trash or not for your friend, let him solo. You won't get saved on your druid but the player that kills Anzu will be saved.
5. Profit!
6. For future summons in the same day, be outside of the instance, reset instance (even knowing you aren't saved for that) and repeat the entire process. To avoid bugs, summon Anzu always first. If the Raven's Claw isn't there, leave instance, leave group and reset again.
Summoning Anzu for yourself (if you have druid alt).
1. Leave your character at the instance door.
2. Log your druid.
3. Summon Anzu with or without clearing trash, but don't aggro Anzu once you summon.
4. Ask friend to create a quick raid for seconds.
5. Promote friend to raid assist and logout (inside of the instance).
6. Log on the character you left at the door and ask friend for invite.
7. You have 2-3 minutes to zone in. You should be in the intance's lock with Anzu summoned by your druid. Once you are inside, your friend can leave the group.
8. Profit! Druid won't get saved and Anzu will be there for any of your characters!
Enjoy.