So basically as I read the article... eventually bats will evolve to change their ultrasound cries to a different pitch/frequency to counter the moth's evolutionary change in detecting their typical predators.
But also as I understand it some bats can "slam" a moth with a stunning pitch cry temporarily screwing up the moth long enough to catch it. Dolphins have been known to do this to certian prey fish of theirs and I recall reading Sperm whales will stun squid in the same manner.
Interesting reading .... for those interested.