as this actually would save your life. Keep one return in the inventory and get another one AFTER you recalled.
Same for teleport potions. But I would keep in the inventory two of them as probably you will need to use second one when teleported to the bad place being blinded.

water <246hp 251m 453mv 8013tnl (34.59%) 9 PM> get 'potion return' endless
quaff 'potion return'
You aren't fighting anyone.

water <246hp 251m 453mv 8013tnl (34.59%) 9 PM>
Gillador has arrived.

water <246hp 251m 453mv 8013tnl (34.59%) 9 PM> You get a potion of return from the girdle of endless space. <-- Here you would be healing at your home city instead of dying.
Gillador trips you and you go down!
Gillador's trip grazes you.