Before he could try again, a messenger arrived with an order commuting Nichiren's sentence to exile on the island of Sadogashima.
The messenger interrupted him before he could try again, by calling out his name. 
mnli hypothesis: The messenger interrupted him before he could try again, by calling out his name.  premise: Before he could try again, a messenger arrived with an order commuting Nichiren's sentence to exile on the island of Sadogashima.