well a few things -
1 - fish will have no concept of punishment
2 - if the clown was hosting as they sometimes will start by taking nips of the anenome, they will become more aggressive and defend their new territory
3 - there is no such thing as a b&W percula, the common B&W fish in the trade is the B&W occelaris (false percula) and the fish in your cage is not an occelaris. I forgot what type of clown the other B&W variety is, but i have heard that they are super mean!
4 - what size tank is that for 2 butterflys ? ....