That's one possible function of the sail, along with sexual selection and thermoregulation and all the other hypotheses that have been put forward. Carcharodontosaurus would easily dispatch even a gigantic Spinosaurus, but I don't think he'd ever try it because Spinosaurus is just so huge and intimidating. I reckon Spinosaurus was all bark and no bite. I think Spinosaurus' head was far too valuable to be used as a weapon. Spinosaurus is an interesting case about which I have my own feelings. They probably lived and perhaps hunted in groups, but I'm just not sure that they were neurologically capable of coordinating complex hunting routines like wolves or lions. I don't think dromaeosaurids displayed complex pack behaviour. That's not inherently a bad thing, but sometimes people over-assume and assign modern mammalian characteristics to ancient bird-crocodiles. A huge issue in paleontology is that there is a huge amount we just have to assume.
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