1) You currently can't cast the second rank of Mind Vision through line of sight.
2) The spell toggles on/off when casted, just like Bear Form or Shadowform do. This prevents chaining the ability by jumping from target to target by recasting the spell.
Veeruli
commented
6 years ago
There are two major issues with Mind Vision.
1) You currently can't cast the second rank of Mind Vision through line of sight. 2) The spell toggles on/off when casted, just like Bear Form or Shadowform do. This prevents chaining the ability by jumping from target to target by recasting the spell.
Source for the chaining mechanic Source for the second rank ignoring line of sight (a wowhead comment from 2006)