A train went by, the rumbling knocked over the glass, which scared them, they bumped into the cabinet which fell over and killed the both
I wonder what the real answer is...
O that makes more sense but i was close
guard2 is a swindlecant and guard1 is an honestant making guard 1s state ment true bu since guard 2 ix not an honestant he must be alive
but thier are probably other answers