The modifier nū refers to the observer’s side of something, so something in front of something else. This makes nū partially synonymous with hāl. The difference is that nū refers to the observer’s position, and hāl does not. If something has an obvious front, then use hāl, otherwise use nū. So, rā NP nū is to this side of NP and rū NP nū is from this side of NP.
rājanū is rā NP nū without a specified location, and so means ‘to this side’.
Likewise rūjanū is rū NP nū without a specified location, and so means ‘from this side’.