Interesting moment in Japanese Department store

So I am in Fukuoka and with my friend at a department store, my friend who just got his payday, he works as a host. We end up going to Louis Vuitton so he can go get his wallet he had wanted for a long time. The person who was in front of us gave me the weird vibe with his tattoo , in his 30s with a pretty scary impression and his girlfriend who was pretty young,mid 20s I think. I’m guessing he’s a yakuza, but I can’t really confirm. My friend chose his wallet and when we were paying he realized he did not have enough to pay for the wallet. The wallet was like 2 grand I think and he need 1万1800円. My man went quiet for like a minute before the scary dude pulls out his “department store point card”. Paid for the missing amount with his point card. He told us to learn money management and I was pretty shocked a guy like him would pay for someone else especially for a “katagi”. I thanked him
me and my friend and gave him a respectful bow. From what I knew, giving someone a confectionery for “お礼”, so while my friend was getting his wallet wrapped, I went down to the confectionery area on 地下2階 and bought some 饅頭。Tried looking for him but I couldn’t find him. I guess he left already.