He could use any nearby objects as weapons. For example, if there are sticks, he can use them to fend off the crabs. Or if he has a net, he can try to catch and throw the crabs away from him.
The man might try to find a high place to climb on. Since crabs usually move on the ground, getting off the ground would be a good strategy. He could look for a rock or a tree stump to climb. Once he's in a safe position, he can think about how to get away from the area completely. He could also try to make loud noises or use fire if possible to scare the crabs away, as they might be afraid of sudden loud sounds or fire.
Naruto could use his shadow clones. He could create a bunch of clones to confuse Anko and then make his escape. This is a classic Naruto move. He might also use his Rasengan if he has enough time to prepare it. The Rasengan is a very powerful jutsu that could potentially fend off Anko's attacks.
Perhaps the man has some sort of special scent that attracts the crabs. They start attacking him in large numbers, biting at his legs and hands. He has to fight them off while trying to find a way to escape from that place full of menacing crabs.
Well, it could be that the man accidentally stumbles upon the lair of these giant crabs while exploring a remote island. The crabs, feeling threatened, launch an attack on him. He has to use his wits and whatever resources he has at hand, like a stick or some rocks, to fend them off.
Estel could potentially use his knowledge of the wild. Since he is in Middle - earth, he may know some plants that can be used to repel the dog. He might rub some on himself to make the dog less likely to attack. Also, if he has any small knives or tools, he could use them to scare the dog away. He would be very careful and calculated in his movements to avoid getting bitten.
In some fanfictions, Harry might use his quick thinking and knowledge of magic laws. He could present evidence clearly, like memories in a Pensieve to prove his innocence. For example, if wrongly accused of using dark magic, he could show how the situation was misinterpreted by bringing witnesses who saw the real events.
He could try to find a high place to climb on, like a big rock or a tree. Since crabs can't climb very well, that would keep him safe for a while.
He could also gather evidence of Alexis' attempts to hurt him. If it comes to it, he can use this evidence to expose her actions to those around them, like mutual friends or authorities in their fictional world. Another way is for Beckett to strengthen his own defenses, both physically if it's a more action - oriented fanfic, and mentally by not letting Alexis' actions get to him.
He might also use his webs to his advantage. He could try to web up Hulk's hands or feet to slow him down. Or he could create a web shield to block some of Hulk's attacks. For example, if Hulk throws a big rock at him, Spiderman could use his webs to create a net to stop the rock.
Snape could use his intelligence. He might outwit them by setting up clever traps or using his knowledge of magic in unexpected ways. For example, he could create a charm that makes them trip up when they try to approach him to bully.
This kind of injustice was indeed very infuriating. If you need a fast-paced and hilarious novel to relieve your emotions, I strongly recommend " Pet Flirting Scum: Begging Beast to Let Go " to you. The story is compact and interesting, and the interaction between the male and female protagonists is also very interesting. It can quickly bring you back to a happy state. I hope my recommendation is helpful to you. Don't forget to share your feelings with me!