they see two flags, one that's being tossed around violently in the air and one that is being fluttered about gently they are used to the one that flutters, they've seen it being waved violently, that's how it first got their attention. but the violent wave can only last so long, the matador will eventually get tired of violently waving the flag and it will get used to the bull's temper and only wave it violently when it needs to the bull takes longer to recognise that just because the matador is fluttering the flag, doesn't mean that the violent wave is gone. it's just being kept for when it is needed most. so the bull, only being drawn to what the surface level shows, leaves the fluttering flag and the matador and charges towards the violently flowing flag.
but, little does the bull know that that flag will soon end up fluttering too because no flag waves violently forever and when the bull realises this, they will realise the mistake they made when they left the first matador and run to the flag that has a sword hidden underneath.