Some people may have been fooled by Bloodhound’s tactical ability, Eye of the Allfather. When the skill is activated, it appears to send an outward pulse around him. This leads many players to believe that the ability would reveal all player’s around him. However, this is not the case. As detailed on this thread on Reddit, the ability actually reveals only players in front of you.
Check out this video where the player uses his scan and then is surprised when he walks into the door. He makes a great choice by scanning an area as he walks in the door. Often times, you will not want to use his tactical ability every time that it is on cooldown. The best choice is to use the ability as a tactical advantage such as these. In this way, you know exactly where your enemy is positioned at inside of a building. However, the mistake that he makes is that the ability actually scans objects in a cone in front of you, and that is why his opponent is not captured by his scan. He is caught off guard and he is killed immediately.