I thought mentioning another solution, if you do not have any sync points left to buy the disguise skill) is quite a good idea:
1. Throw a smoke bomb and go for hit by pushing
2. Hide behind a pillar, if the there will the slightest sign of any "light" at your position and the enemy is saying you cannot hide, switch to another pillar and hide
3. After his attack throw another smoke bomb and go for an attack buy pushing
4. Hide again and repeat the steps above
It took me three smoke grenades.
credit goes to TheOnlyMatto
who mentioned that in the other solution in a comment