u/CLORAMEL

This is the 4th movement of Gliere's 8 pieces for violin and cello, and I cannot figure out for the life of me how to do the fingerings for the first bar of the second line in the image. I've tried 3 on the Bb and 1 and 2 on the other two notes, 1 on both F and C, or thumb, but none of it sounds very good. Suggestions? I'm desperate.