If he was slower we would make a boss chase. Like in Sonic Advance 2. Oh well, not exactly, because in SA2 you can run as long as you want because the level is looped, so then if you won't make it to destroy Rocket Turtle he will stop. If we make him stop on other side of wall, we'll have to die on spikes and chase once again, or shoot the unmovable boss calmly. The point is, it would be fun to make a chase like that, but it's almost impossible.