Look at example:

methodA
�� | result |
�� result := false.
�� [result := self methodB] ensure: [result ifTrue: [...]]

methodB
�� result := 1 < 2.

�� ^result

Imagine now that methodB starts execution in context of call inside methodA.

Is it possible to terminate process at point of methodB return (^result)?��

In that case ensure block in methodA will perform wrong logic.