This is the 7287th most frequent Russian word.
вспышки
Flashes or outbreaks.
In this sentence, 'вспышки' refers to instantaneous bursts of light from lightning.
Во время грозы на небе были яркие вспышки молнии.
During the thunderstorm, there were bright flashes of lightning in the sky.
Here, 'вспышки' depicts sudden and intense outbursts of emotion, specifically anger.
Вспышки гнева на лице начальника испугали сотрудников.
The flashes of anger on the boss's face frightened the employees.
In this instance, 'вспышки' describes the repeated bursts of light from camera flashes.