Hi
@taylanshn 
I agree, that looks like it very well may be a partial stem node, which may produce roots and new stems but rather than trying to root it in water, I'd follow Gina's advice by wrapping it in moist sphagnum moss, being sure to keep the moss moist/damp while watching for roots to appear before potting it in soil. When the time comes to pot it in soil, use a small container with lots of drainage holes and be sure to use a light, porous potting medium, which will allow for good aeration at root level and proper drainage.
For the 50+ years I've been interested in and growing and occasionally propagating plants, I've stuck many cuttings in water and they do indeed produce roots but the thin, watery roots always have difficulty acclimating to soil conditions once the plants are potted up.
