"Yeh don' want ter be invisible," Hagrid told them. "Jus' because yeh shouldn' be pickin' 'em up doesn't mean yeh can't do nothin' at all ter make 'em take notice like." Maybe he shouldn't have explained better about what they could and couldn't do because most of them looked a might scared to do too much. Goyle looked to be attempting to blend in with the rock wall.