Onar Extortion mission question

By totalnoob, in Imperial Assault Rules Questions

We are playing extortion but I think I may have misinterpreted the rules on the second stage of events in this mission. I’ll put in spoiler

After the door to the Cellar opens there is a mission effect that reads like “during his activation a hero may choose an adjacent door and may test Tech or Strength to open the door. Once per activation.”

I just assumed that was an interact action, that could only be done once per activation. But now I am thinking that perhaps this attribute test doesn’t cost an action , that is why they spelled it out the way they did. Any thoughts?

It doesn't seem to be an action. It's choose X, perform an attribute test to see if it succeeds, limited to once per activation.