Groot was just Groot, wandering around this Earth place however and whenever he liked. Sometimes he got into trouble, mostly he didn't, and scampering through the forest he'd thought he'd be safe. All the things that looked sort of like him would camouflage him and he could explore in peace. Without Quill constantly trying to get in his way. His friend could be a real pain in the ass.
His assumption about going unseen couldn't have been more wrong, he realized, when an arrow went sailing right by him. Groot leaped aside, scrambled to his feet again to wave his little arms angrily.
"I am Groot!" he raged. How dare the stupid squishy human try to shoot him for nothing!?