He was pressing beyond the limits of his vocabulary. 
hi wɑz pɹɛsɪŋ bɪɑnd ðʌ lɪmʌts ʌv hɪz voʊkæbjʌlɛɹi. 
 Indian speaks in a monotone voice at a moderate speed, and the speech is recorded in a very clear manner in a close proximity.