DISCLAIMER: I do not own the Avengers or the Justice League.

While Thor and Wonder Woman took to the air, Batman flung several batarangs at Spiderman, watching as Spiderman dodged every one of them. Batman charged, readying his Taser. Spiderman attached a web to Batman, pulling the caped crusader to the deck. Batman cut the web with the edge of one his batarangs, before jumping out of the way of Spiderman's kick, and flinging a batarang at Spiderman at close range.

Spiderman easily dodged the projectile despite the close range, attaching webs to Batman's feet, before jumping up and punching Batman in the face, dazing him, before jumping into the air and kicking Batman in the head, knocking his mask off. Batman caught Spiderman's leg and Tasered it, causing Spiderman to convulse violently, before punching Spiderman to the deck, and then using a batarang to cut the webs that fastened his feet to the deck. Batman cut through the webs quickly, before turning to have Spiderman's fist collide sharply with his face.

Batman went flying across the deck, flinging a batarang at Spiderman, which Spiderman dodged, attaching a web line to Batman's leg, spinning him around. Despite being spun around, Batman was able to reach the web line attached to his foot and cut it, feeing himself.

As Batman prepared to attack Spiderman, Spiderman already stood over him, swinging a punch at the dark knight's face. Batman caught Spiderman's fist, twisting it and dislocating Spiderman's wrist, before twisting it further and dislocating his shoulder. Spiderman slammed his other fist into Batman, sending him across the deck.

Batman recovered just as Spiderman's foot connected sharply with his nose, breaking it, and spraying blood all over Batman's face. Batman caught Spiderman's leg, pulling it downwards and twisting it, dislocating the knee. Spiderman fired a web onto Batman's face, before slamming his good fist into Batman's jaw, sending him flying once more.

As Spiderman struggled to stand on his one good leg, preparing to use his one good arm, Batman stood, dazed and covered in his own blood, his mask gone, readying his Taser. The two charged, slamming into each other, attacking each other. Batman Tasered Spiderman's dislocated shoulder several times, before Tasering his dislocated knee. Spiderman gripped Batman's wrist, pulling the Taser from his grip and throwing it aside. Batman threw a flash bang grenade, while Spiderman readied to throw a final punch.

The flash bang grenade worked, releasing a burst of light, which completely obscured both fighters from view. Thor flew back onto the deck to see Spiderman crouched over, stunned by the flash bang grenade, and Batman lying on the deck, unconscious, his face looking damaged. Spiderman finally straightened up. The effect of the flash bang grenade had been slightly lessened by the tint on Spiderman's mask, and also Spiderman had covered his eyes with his mostly limp arm.

Reasons for this outcome:
1. While Batman's skill is far greater, there is no denying that Spiderman is stronger and faster.
2. While Batman can handle a great deal of punishment, he is limited by being human, and Spiderman's punches would certainly take their toll.
3. Spiderman has been shown to be able to resist things like electric shock, shown by his victories over characters like Electro and Shocker, and would also be accustomed to fighting technology and strange weapons, as Batman's weapons are rather similar to those of the Green Goblin, though the Green Goblin is very dangerous to Spiderman because of those very weapons.