The best term that describes the way Henry has handled the situation is "bulldozer".
Henry seems to have taken a confrontational approach, talking to the other guys about the argument, portraying Sid in a negative light, and warning them to be careful when dealing with Sid. This approach is aggressive and disregards Sid's feelings, suggesting that Henry is trying to push his own opinions and feelings onto others.
A "bulldozer" is someone who tends to be aggressive and pushy, often disregarding other people's feelings and opinions, and trying to dominate or control situations. In this case, Henry's behavior seems to fit this description.