Why Stoner and Hardy aren't effected by Pegasus and Freezer effects? Looks like bug. If intended, makes this babies much less appealing when this enemies appear..
Its a feature, its supposed to stop people from just using the two and pushing back EVERYTHING in their path.
Also like reason: Naked = available to get frozen, slowed or other effects. Rock = protected against wind, fire, ice and more.
Get it now? (Also the stone enemies are made to COUNTER babies who inflict effects on hit.)