It seems like this all happened very quickly and with the gunfire, chaos ensued.
There was some type of commotion at a different venue, which some onlookers may have had reason to think there was a connection and possibly had seen or heard the argument between Thais and then assumed it carried over to the location of the shooting.
One particular witness, Mr. Amnuay mentioned the victims looked like foreign tourists. And, they were rushed off in a black Toyota Alphard van, which does not seem like a common vehicle for tourists, but possible. Perhaps Amnuay had recognized the people in the altercation and was protecting them by attempting to mislead the police.
It's highly likely that the black van drove to an emergency hospital and will be detected and a plate will be run.