If you click on the info button on the special ability reward, you will see that it can only be used for players with no special ability. In fact, second special ability should be right below, in the “premium” rewards.

The ability selected being random is a trick of Nordeus I think. Nowhere it’s stated that the ability will be random (unlike, for example on fire reward being applied to random players is clearly written). In the previous event, I fell for the same idea and now I have a DC with corner ability.