PSA: If you use a TZ tracker and you know the next rotation is A1/A2/A3/A4/A5 boss you can "set up" a game so you can get a TZ boss skill within 30 seconds of the TZ boss area spawning.

There is a trick to it. You CANNOT zone into the boss area BEFORE the TZ switches over to Act boss.

For A1 make a portal right next to Cata lvl 4 and wait for spawn

For A2 search for Duriel tomb and wait for spawn.

For A3 make a portal right next to Durance lvl 3 and wait for spawn.

For A4 you can pop 5 seals but and a portal and wait for spawn then pop 6th.

For A5 make a portal right next to throne and wait for spawn.

You should wait in town but it works.