Make trades reversable for a short period of time

[Soundlesskill]

Act I: Scene IV

~~Setting: Traveler's Outpost, Day~~

ToonA: I'll give you 5 locked crates for 20k
ToonB: (O.O omg yay!) Okay!!!

[Trade happens]

ToonB: Oh my gawd thank you!!!! ))
ToonA: No problem

-4 minutes later-

[ToonA recalls and cancels the trade]
ToonB: ...:'(
ToonA: Muahahahahahaha >

End of Scene IV

Toon A: 10m for those

Toon B: Deal

4 min later, realize they removed a 0.

*cancels trade*

Thank falmear