Bull works, you need the Rush "it need the name rush" in the last slot "0" and after you did bola, you need to be in front or close to hi head, but yea, he will hit you hard, so bull is for me harder then a tiger. good luck
takes about 4-5 bolas for a lvl 4, if you dont miss timer is on 15sec so ever 15sec you can give him the rushes