Does oxygen really affect the heat of the actual flame?

"You have to pay at least a hundred if you want to see actual flames."

Could I heat the air without causing any actual flames?

The size of the blaze generated extremely strong winds and heat, which ignited rooftops far ahead of the actual flames.

The navigator looked out the observation portal and saw that the aura had become an actual flame.

(An "ember" is a lump of matter that burns without actual flame.)

That one had begun drifting with the breeze and showing some evidence of actual flames.

It was an unerringly straight line, Ruth could see the wood turning black an instant before the actual flame shot up.

How this produced the effect of actual flames was something too complicated for the visitor to analyze; nevertheless, he became more at ease.

He said it was not immediately clear if the interaction created heat or actual flames.