Hearthpwn

Hello people of the internet. I found a bug (and/or maybe a very consistent gameplay):

I was playing as Rafaam, and I faced an opponent early on. His Monstrous Macaw attacked first, but didn't die. However, it did trigger his Scallywag. It attacked my minion and I was able to steal this 1/1 Pirate. It has no description on this card, which means it should be a 1/1 vanilla minion. Scallywag does imply it attacks immediately, which means it should attack immediately. 

I was in Bob's tavern deciding what to do. Pressed hero power, and then played this minion. It came to my surprise that the minion straight on attacked another minion in Bob's tavern, and I stole it with my hero power. 

I do not know if this is meant to happen, because it plays consistently according to Scallywag's description, but this vanilla card has no description. My best guess as to how correct this would be to add description to this card saying "Attacks immediately". I know it is a very, very rare scenario, but Hearhstone has been known for being quite consistent, or at least with my experience comparing to other TCG's

Thanks for listening, you deserve a cookie, and a wonderful day.