They Fought

The Tesseract was a cube of nearly bottomless energy. From portals to powerful laser beams, this single cube could probably power any device that the user wanted.
So it made sense to Natasha that this sudden duplication was the result of Red Skull trying to take them down.

The two nude Black Widow agents faced each other, not letting a second pass before the tried to punch each other. Their fists clashed, repeatedly meeting between them over and over again as they attempted to punch each other down. Their moves seemed to perfectly counter each other with every hit, a perfect clone in Black Widow's opinion.

The two fought fiercely, not letting up as they relentlessly punched and kicked each other over and over again. Red Skull simply looked at them in shock, having absolutely no idea of what was going on. But who cared? As long as Black Widow continued to fight herself he could get away with this. In fact, it would help him if he could just make them fight even more...

An idea popped into his mind. He was going to 'help' them a bit.