We believe the issue was that a big impact to Pulsar would cause the receiver to brown out (possibly a loose connection). The ESCs would then shut down, and for some reason could only be restarted by switching the transmitter on and off. Good thing that Ellis worked this out as fast as he did, though I do wonder if the ESCs would have reset themselves and done it faster had he just left it.
I gave a detailed insight into Pulsar's electronics here.
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