New camera shoots at 5 trillion frames per second

Hm. I’m trying to get my head around this, because what I’m reading here doesn’t make much sense:
They claim to have filmed a group of photons by bouncing coded laser light pulses off them?

That’s theoretically possible, but not very likely (http://sciencequestionswithsurprisinganswers.org/2013/09/06/can-one-bit-of-light-bounce-off-another-bit-of-light/)

What am I missing?

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