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OMG, that was one hell of a recoil to kick that much mass away at 2650km/s! Just... WOW!

I was going to post the same thing. Anyone want to do the relatively easy math? How much energy is required to accelerate the mass of 100,000,000 of our suns, to 2650 kilometers per second? It boggles the mind..

The effect that sends the black hole out of the galaxy is more akin to the column of liquid which pops up when an object is dropped into a calm pool of liquid (perhaps water for ease of comparison) ... the popped up column is a recoil from the object slamming into the pool. Now, the interesting hidden question is ‘what is the recoil pushing against, what IS inertia in spacetime?’ From contemplating this notion I haved conjectured that what came first in the big bang event were all ‘black holes’, a froth of black holes caused by merging dimension space and dimension time, which caused mass to wink into existence carrying a little bit of time and a little bit of space as the ‘remnant’ of the black hole which spawned the speck of mass, thus mass is the shadow of the original froth.

How much energy is required to accelerate the mass of 100,000,000 of our suns, to 2650 kilometers per second?

I tried this with questionable results, it just seems a little too extreme. kinetic energy = ¹/₂ * mass * velocity². So, by converting all units to kg, meters, and seconds the result should be in joules. The sun weighs 1.9891 * 10³⁰ kg, so the black hole weights 1.9891 * 10³⁸ kg. Multiplying half of that by 2,650,000² (speed in m/s squared) gives 6.9842 * 10⁵⁰ joules.

That's a bit abstract, so then I figured how much matter that much energy represents. Using E=mc², 1 kg of matter = 9 * 10¹⁶ joules as energy. Dividing that into 6.9842 * 10⁵⁰ gives 7.76 * 10³³ kg. That's 3,900 times the mass of the sun. In other words, 3,900 of our suns would have to be converted into pure energy to accelerate a black hole of that mass at that speed. That's quite incredible if it's correct. The "action" needed for that "reaction" is all in gravity waves, though, which are fairly passive.