Looks like this is related to other mid-combo issues out there but I think there might be a Composite Construction issue as well. With 85% ability reduction, Modok's Force Fields shouldn't trigger as much. https://youtu.be/tSfLH-lGGYc
He didn’t block, he triggered a Forcefield. Think of the Forcefield like a solid wall and it would make sense that MODOK could move freely behind it.
The attack was blocked by the Forcefield, MODOK himself did not block the attack. You know how I know? Because if MODOK was blocking the attack the Forcefield would not have triggered. #logic