Jacob had just said hello to the two girl when someone else entered. He turned around and a smile appeared on his face as he saw that it was Sirius.
He then let out a barklike laugh at the older mans words. "You're welcome to follow, mate", he said and clapped Sirius on the shoulder in a friendly manner.
"Here to lean something new?", he then asked. He somehow didn't think a wizard needed to know how to fight.