The answer comes to Vali, teased out of broken metal by magic and knowledge and the Art of Soothsay - and like all Omens, cryptic and vague. Though he blows to extinguish them, he sees a vision...
On three of the candles the flames flicker back to life, with wisps of smoke spread and solidify taking forms atop each of three candles. Vague, little more than a fuzzy smoke outlines without defining features.
Black, Grey, and Red candles, each with a smoke figure atop them, the candleflames burning in their chests.
Grey, arms outstretched, reaching towards the figure that curls atop the Red candle, facing away.
The Black figure gestures, and thin chains of smoke whisk in and wrap themselves around the Grey figure, twining and squeezing. Grey's arms lower, then it turns, away from Red to face Black, and the light from Grey's candleheart dims, flowing along the chains, and strengthening the fire in the Black figure's core.
The figure floating atop the Red candle remains, unaffected, yet no longer seen by the Grey.
After a few moments, the smoke wafts away and the candles go out as intended, signaling that the omen is complete.