Due to the threat of the father, Vinsmoke Judge, of course Sanji's actions are a wise thing to take at that time. Unlike Luffy, he still waits for Sanji at his battleground.
Before meeting Sanji, Luffy has defeated the commander and son of Big Mom, Charlotte Cracker. Big Mom will be very angry if his commanders are defeated, and will send an army of revenge.
Your Browser Do not Support Iframe