If you play on mobile and want to do the roll then go to settings left or right multi tap and chose alt attack 2 !!!

NOW FOR THE MAIN PART--- THESE THINGS CAN KILL GIGAS the normal roll does decent damage but if you roll and attack a dino while watching the dino through spyglass you can deal tons of damage (this works in mobile idk about other platforms) i killed tons of rexes,brontos,allos..etc. using this trick

Δ IF THIS HELPS~~