Hmmm…this is a mystery that requires my full attention. I'm sure with the help of logic and my extensive knowledge of the crimnal mind; I'll be able to deduce the origin of this frantic plea.
First off the use of the board as a way of convey such an important message can mean only one of two things. One, that Merla is incapable of using a more reliable for of communication, such as a phone. Or the second, that posting on this board is seen as a faster easier way to get ahold of Nuri and insure that she will see the message. The latter is more logical of the two...so we deduce that Nuri does indeed spend much time on this very board during these hours.
The message also cannot wait for Merla's arrival back at the home which she and her sister share. This tells me that it's something of either a timely nature, which must be dealt with promptly or an emergency of great magnitude. But having the privilege of having at occasionally been around Merla for the last five year, combined with what was confined in me by Nuri herself...I know that Merla is of an excitable sort and is probably making a bigger situation out of the matter then is necessary.
Hmmmmmm very interesting. More evidence is required to reach this case's conclusion. Come my dull witted, but faithful friend, the night is young and Mystery is afoot!