Morde ult has a secondary wall that morde cant reach that some champions can abuse

When you ult some champions, like kled if they ult within the death realm they unstoppably move to the outer edge of the ult. The problem is the wall they run into is not the same as the wall that morde runs into. They seem to be outside of auto attack range, barely in Q range, can not be pulled by E, and they just have to sit there ulting until mordes ult runs out.