OMG!!! U might be right??? If it plays out like that Yasa is pointing his gun at Charles then perhaps Fah has a flashback to the time Saichon was beat up and almost killed by Yasa... Then bits and pieces of her memory comes back, and after seeing the flashback, she calls out Saichon's name and runs toward him and take the bullet for him. If it played out that way then it would be better than fah taking the bullet for prae.After watching the ep19 preview over and over and analysing with my friend we both think the bullet was aimed at Saichon/Charles and Nang Fah/Fahlada saved his life (Reason why he has blood on his shirt) Prae was nowhere near the bullet she was safe in P'mors arms and if someone saved your life you wouldn't immediately get up and hold onto P'mor while your sister is lying there.
It feels as if prae is not gonna get any punishment except for being remorseful and coming to the conclusion that what she did was unacceptable, sucks!!!