u/Oli4-1302

For example, Ryan can't read Clark's mind, so he is unaffected by Ryan's power, but Clark cannot pass the force field those creepy twins from Belle Reve made around his house and is his mind is affected by Simone when she breaks him and Lana up.

EDIT: bad example bc I forgot he didn't have his powers when the twins were at his house. But someone explained the answer below so I get it now!