Baslod is a Nord assassin found in Raven Rock. If the Nerevarine chooses to help Carnius Magius, he will help and distract the guards when attempting to assassinate Falco Galenus. However, if one chooses to help Falco Galenus, he is one of three attackers who will attempt to kill him.
Carnius Magius has instructed the Nerevarine to assassinate Falco Galenus. There will be someone waiting once they are ready; they should go to the top of the mining office tower and draw the bow that has been left there. That will signal to Baslod that he should proceed.
Falco is concerned about a possible attempt on his life, and wants some help to remain safe.