There really isn't much you can do, tbh. You have two main options.
There's quite a few things he can do. There just aren't too many categories, ie. "Agressive" and "Non-Agressive."
a) Tell them off, and probably start a long fight that will end with someone getting their ass beat
Here he could either:
-Blow the fuck up at them, calling them various names, and making himself look like a loud asshole while they cringe in the corner
-Explain to them how they are being loud, attention craving assholes and calmly tell them that they will never be loved, while being as intimidating as possible
-Beat on them on the spot while looking like a violent asshole
-Wait for them to be alone and whale on them, bring your friends when they bring theirs
-Bring your friends and call them out while they look intimidating in the background
b) Sit quietly and ignore it. Even if she's your friend, she has to fend for herself, and I understand how you feel.
Her,
one girl, fend for herself against
three or so guys with tougher friends? Letting the lone sheep fend for herself against a pack of
wolves!? Not only is this a spineless, unjust, cowardly, uncaring, self-centered, loathesome thing to do, it's also the
wrong spineless, unjust, cowardly, uncaring, self-centered, loathesome thing to do. From what I understand, Doomsday is fairly strong, and perfectly fit to fend for himself
and others. What reason does he have to slink away while his
friend gets harassed?
That's pretty much all you can do, this happened to me and this kid that's roughly 5'3, and I still want to punch him, and he and his ghetto bruh fut wit it friends want to kick my ass. Lucky i'm a wrestler.
Mistakes are in
bold. Also, being a wrestler is only really useful if you're going against one guy. If he has brought a posse, don't expect to leave without a black eye or two, and perhaps a couple missing teeth. I also suggest bringing your clothes to the wash afterwards to get all of the shoe marks out.
I highly suggest learning a few styles of Martial Arts (Tae-Kwon-Do, Krav Maga, and Hap Ki Do are my personal favorites, but I suggest Judo if you're a wrestler).
But so anyways, if I were you, just keep it cool. It's tough to watch a friend get bullied, but you have to be strong
I'd rather defend the helpless than "be strong" and watch them get pushed around for the rest of their lives. But hey, that's just me.