Have you ever thought about how in many series water based villains become stronger in water? Doesn’t make sense (unless water is the source of their power, ala the Submariner. ),

I mean that they can swim faster and have an advantage over surface dwellers is fair enough. But basic physics says your punches will be MUCH weaker, due to the waters resistance and also if you float you have nothing to push against to gain force.

So say our dear octopus villain was stronng enough to punch through the glass on land. He ironically probably wouldn’t be able to in the water.