Two Reasons

Pablo gave the order. An order that was not received well by Fuhrer Jamal. He didn't understand.

Pablo really told all the soldiers who could use fire to go all out.

And as Jamal sees it, Pablo did that for no reason.

"Why are you ordering such a thing?" Jamal asked right away.

"I am the leader, sir Jamal. Let me handle things my way."

Pablo ended the topic and addressed his soldiers again.

"Don't wait for anything. Just shoot your fire as far as you can. You all are allowed to burn everything. Don't worry about burning your comrades. We are already on fire. Just Burn every fucking THING!!"

Pablo hollered the same order again and the soldiers acted on it right away.

They were waiting for some action for a long time and now they had Pablo's permission to wreak havoc. And they would certainly do that.

"BURNNNN!"

"Burn it all!"