It doesn't seem that much for a heavyweight tho, guys like Cotto, Canelo, or Golovkin who are tiny compared Browne can produce that
It's deceptive. I've been hit by guys the size of Lucas and, even when you block, it absolutely drains you and you have to fight to keep your balance. Smaller guys have more stinging impact but big guys have the battering ram effect. Like a shotgun slug vs a .223 round. Damaging, but in different ways.