These four sample illustrations show inauspicious poison arrows of neighbouring block in close proximity of a unit.
All four illustraions are considered poison arrows aimed towards the main entrance of that unit.
If in doubt, best to avoid purchaing a unit aimed towards the "vulnerable" main entrance.
Illustrations:
1. The corner of the neighbouring block aimed towards the main door at a 45 degree angle.
2. If there is a V shaped point aimed towards the main door.
3. The main door is facing the "barrel of a gun/pistol or rifle.
4. Similar to your photo. Showing the head of the hammer ...aimed towards the main door. See below:-