First of all: Get your strongest unit and head to a Spino. Second of all: When you see your creature getting more bloody than the Spino, Distract the Spino, Go to your base & get your army prepared, once the Spino comes whistle at the Spino & fight, helping your units is a great solution if you start losing whistle all your guys and run away with the guys. Find a powerful unit your 100% confident you can take down, feed it while it’s unconscious, head back to the Spino then send your overpowered army to it use all your strength to rather tame it or kill it.