

Edit 2: Eheran pointed out I screwed up the math. Correct total energy output is 13μWh. A very, very, very small amount of energy.
(2x1015 W) * (25s/1x1018) * (1 h/ 3600 s) = 13μWh
Previous bad math:
spoiler
The key thing here is the burst lasted for “25 quintillionths of a second long”. Meaning it had a total output energy of 180 W/h, or how much energy a standard US space heater (1.5KW) outputs if it was on for 7.2 minutes.
That is a pretty impressive amount of power coming in instantly to a small spot. Would leave basically zero time for it to dissipate into surrounding materials.
Edit: Fixed the math. (I hope)
(2x1015 W) * (25/1x1018 s) * (3600 s / 1 h) = 180W/h
Crap, you are right, units should be in Wh not W/h and as a result I put the conversion to hours backwards. Well, that turns the whole thing from an impressive amount of energy to basically none!