(This is very interesting. I will have to make a few assumptions though. The first being Jason doesn't know exactly what Stain's ability is (which I think is what you meant) and the second being Red Hood and Stain have minimal armor for balancing, otherwise Red Hood SMOKES Stain)

After months of tracking the mysterious killer, Red Hood finally caught him in the act. Unfortunately, he wasn't trying to find him in this moment. Instead of him being Red Hood, he was Jason Todd, who was returning from a party he was forced to go to by Bruce.

"Oh come ON!!!" Jason yelled as he realized that this was a one time opportunity, either attack him now without the suit or let him get away, possibly killing more people.

He threw off his coat jacket as he ran towards the alleyway. As he reached the site, he saw the madman standing over over a well known entrepreneur who was staring in fear as Stain slowly licked the blood off of his serrated sword. Even though Jason didn't have his usual metal helmet, he did, however, have his red batman mask.

Stain turned to Jason, grinning from ear to ear. Jason shouted "You aren't going to kill again." Then cringed realizing how dumb he sounded. "Oh? And why is that?" Stain remarked. Jason said "This is why." As he charged towards Stain.

Jason drew his pistols and blocked Stain's attack, then kicked him away from the man. He motioned to the man to get up, but he was frozen with fear in his eyes.

Stain charged at Jason again, who blocked again but not before Stain cut Jason's shirt. Jason leaped back before he could get cut by the blade. Jason shot 2 bullets at Stain as he charged at him, both hitting the wall behind him. Stain jumped at Jason, his sword aimed for his gut. Jason jumped back, but was lightly knicked, drawing blood. Stain was about to lick the crimson liquid before falling down, hands clutching his stomach. The smoke was still billowing from the barrel of Jason's gun. Jason walked away before the Entrepreneur could unmask him.