At once, the crab understood what the heron was up to. 
æt wʌns, ðʌ kɹæb ʌndɜ˞stʊd wʌt ðʌ hɛɹʌn wɑz ʌp tu. 
 Indian's voice is monotone yet clear, spoken at a moderate pace in a quiet, echo-free environment.