Intensity plus, Spinosaurus was the largest semi-aquatic predator in history, feasting on fish and other such fauna residing in huge lakes in Northern Africa around 95 million years ago. Seems Spino had a tail, a big one, meaning this bad boy probably swam after prey as per the modern crocs of today.
And this.
Intensity + indeed.
Addendum: Check here to see how Spino actually moved in the water. Croclike without question. :)