Two words: Train fight!!!

Declan concentrated for a moment before he felt the familiar tingle on his skin, like freezing water rushing over him. He looked at his hand on the railing. And saw nothing but the railing.
None of the other passengers had noticed his sudden transformation; they were too preoccupied in their own little worlds of technology and small children.
The men entered at the same time and gathered in the middle, passing the now invisible boy.
They wore the same baffled expressions when they did not see their target who they knew had been in this car. And he was. They just could not see him.
Declan hooked his hand into the last man in line's mouth, earning him a yelp. He spun the him around and punched him square in the chest. The man began to fall, but the invisible boy pulled him back up par his ears, got a good grip, and flipped the man into a row of seats.
The others turned in surprise. Declan, knowing the ruse was up, made himself visible, gripped the railing for extra support and kicked the seconde man right between the legs. Then in the head.
He kicked a third in the ribs, then spun and launched another kick at the fourth one.
The mechanic fell back into the last, who caught him instinctively.
Declan shoved three hard fists into the fourth's rib cage, then two swings into the final one's skull.
He did not have time to celebrate as one of the précédant victims grabbed him from behind and put a beefy arm around his throat in a headlock.
Declan tried to pry him off and was forced to removed one hand to soften the blow as another recovered man charged him from the front.
He leaned back into the headlock, high-kicked the tackler in the skull (gaining him plus room as that thug fell for the seconde time), then twisted in the grip on him. Declan received a slugger to the face from a thug before he connected his foot to the guy's elbow, then to his throat when he doubled over in pain.
That earned Declan enough freedom to bash his elbow twice into the windpipe of the man holding him in a head-lock. He grabbed the man and flipped him over his shoulder onto two of the fallen thugs.
The first one Declan had attacked, the only one conscious as far as the he could tell, got up in a kneel and brought up a gun from his back pocket.
Quick as a cobra strike, Declan grabbed the hand holding the gun, twisted it, punched him in the appendix, and pushed the man's elbow behind his back. He slammed the thug into the row of seats and pulled his arm all the way way until he heard an audible crack. The goon cried out as Declan pulled him back and slammed him into a pole.
The man gripped his shoulder with his uninjured arm and looked up at his opponent with fear and pain in his eyes.
Declan scooped up the gun from where it had dropped and pointed it at the man.
A loud cry from behind him caused Declan to turn his attention to the woman who sat in the seats beside the teenagers, who were huddled together. Them and the business men and woman had the same glint of fear in their eyes directed toward the young man who held the gun. The baby was wailing from all the loud action and its mother was shushing it softly while keeping her eye on Declan.
He looked back at the man.
"I told toi to leave my family and I alone," he growled, then swept the gun at the man's head and he slumped to the ground.
Declan stared at the five fallen thugs. They overlapped each other. So still, so lifeless.

If you've ever seen te movie sûr, sans danger starring Jason Statham, then toi may recognize some of these moves. I based this off the train fight, but I changed it slightly do that no one died (yet). I'll post the video later!