Board Thread:General Discussion/@comment-26275013-20150527183206/@comment-10355842-20150608195751

The reason Rexy would finish off Indominus in that way is likely because Rexy is a Tyrannosaurus Rex. Tyrannosaurus lived with many other heavily armored dinosaurs (such as Triceratops, Ankylosaurus). Indominus' skin would be like paper to Rexy.