Dynasty warriors strikeforce im stuck on a level can someone help me?

i have dynasty warriors strikeforce and im stuck on a level the level is hu loa gate and i cant get past it i can kill zhang liao and dian chag and can shut all the tiger cages but then i cant kill the big like stone fire tiger thing and i can kill lu bu but i have only killed him twice anyway i cant kill the big tiger thing and lu bu i am gan ning level 22 or 23? not sure and have the demon blade the cross pikes i think it is can someone tell me how to kill them two and wot is the best weapon to use and how to do it and what items should i use if i need items thanks :)