It should be pretty obvious that the rule should not fire after the
insertion of a single fact.

declare MyEvent
@role(event)
end

rule FaultsCoincide
when
   f1 : MyEvent( key == "type1" ) over window:length( 1 )
   f2 : MyEvent( key == "type2" ) over window:length( 1 )
then
   System.out.println( ">>> f1=" + f1 + " f2=" + f2 );
   if( f2.getKey().equals( "type1" ) ) System.out.println( "*** BUG ***" );
end

insert MyEvent<type1,ALARM>
>>> f1=MyEvent<type1,ALARM> f2=MyEvent<type1,ALARM>
*** BUG ***
insert MyEvent<type2,ALARM>
>>> f1=MyEvent<type2,ALARM> f2=MyEvent<type2,ALARM>
>>> f1=MyEvent<type2,ALARM> f2=MyEvent<type1,ALARM>
*** BUG ***
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