Try again to fix the bikeshed bug?

spec.bs

@@ -849,10 +849,13 @@ For now, see [https://github.com/wicg/observable#operators](https://github.com/w
                 1. Set |activeInnerSubscription| to true.
 
                 1. Let |innerObservable| be the result of [=Invoke=] |mapper| with the passed in <var ignore>value</var>.
-
-                - If <a spec=webidl lt="an exception was thrown">an exception |E| was thrown</a>, then run |subscriber|'s {{Subscriber/error()}} method, given |E|, and return.
+
+                    If <a spec=webidl lt="an exception was thrown">an exception |E| was thrown</a>,
+                    then run |subscriber|'s {{Subscriber/error()}} method, given |E|, and abort these
+                    steps.
 
              1. Let |innerObserver| be a new [=internal observer=], initialized as follows:
+
                 : [=internal observer/next steps=]
                 :: Run |subscriber|'s {{Subscriber/next()}} method, given the passed in <var ignore>value</var>.