Luffy just got beaten by Sanji. He refused to fight back. Sanji had betrayed the crew, and he had left for Whole Cake Castle.

Luffy was lying on the ground, and it was raining. You were by his side, you were close to crying. You were scared Big mom's army might find you two and attack you when you are exhausted. Luffy suddenly said :

"Go hide."

Blood was running down his nose and he had a serious expression. He definitely wasn't joking...