Just to put in in perspective:

Kroor said to the user dennmarko that he would return 110% if dennmarko would send him btc. And so he did.
Kroor said as well that if he'd lose, he'd pay it from his own btc.

Kroor did (unfortunately for dennmarko) lose.

What happened next is that Kroor said to dennmarko that he needed to confirm in the chat that he got his coins, while Kroor actually didn't send, so that others would think that kroor actually returned the money (which he didn't).
By doing that, he hoped that others would trust him as well, so that he could get others money.

All in all: kroor didn't return dennmarko's money, which he promised to do. After that, he wants dennmarko to lie in order to scam even more others.