If you only realize the short position after trading hour then it goes without saying that there's no way for you to cover ( buy back ) .... as a result KLSE will penalize you by way of buying-in.

UNLESS you can make immediate transfer of that particular share : the latest before 12pm on T + 2, and that too is ONLY possible :

* for immediate families member ( i.e husband-wife, father-daughter, brother-brother etc )
* you need to show document proof of your relationship ( i.e marriage cert, birth cert etc )