Wiktionary
flare up at
vb. (context transitive English) To suddenly display anger at.
Usage examples of "flare up at".
She felt that the lights would flare up at any moment behind the great sheets of windows, under the long, flat roofs.
In his mind's eye, he saw the fighting flare up at the outskirts of the rebel armada, then work its way inward, zigzagging through the rapidly intermeshing fleets like spidery cracks fragmenting a sheet of ice.
To flare up at the wrong moment, and turn and bite you, yes, Pyanfar Chanur.