Can you summon party members back to a dungeon if you hearth after pop?

[nodoze]

I vaguely remember in Vanilla/BC having a summons pop and then hearth-ing and doing stuff real fast and then taking the summons before it expired (something like 2 minutes max). I remember doing that on both my Warlock casting the summoning as well as doing that on the other party members...

If that is still how it works then you could use a single Warlock to get everyone's (including the Warlock himself) inventory cleared & gear repaired if/as needed without running back and forth and should be able to do it right outside the instance.

Can anyone confirm that the above is true/working on live Classic?

While you are in an instance can you summon someone in the same instance (like at the beginning) to your location in an instance (even if you are at the end)?

If summoning when everyone is inside the same instance works, can a Warlock, while in an instance, summon someone (including themselves) also inside the instance, and after it pops can they hearth out of the instance and sell/repair real quick and then take the summons back into the instance?

I ask in part as I was reading a guide and found the following quote and it got me thinking back to Vanilla and how things should be working on current Classic and the wording was a little vague:

"... Having a Warlock is extremely useful in these cases, as they are able to summon players back to the dungeon. Warlocks can even summons themselves, then HS out and accept the summon once done selling. ..."