  It was conjectured that bions, semi-classical objects found in a compactified
spacetime, are responsible for the cancellation of the so-called renormalon
ambiguities. Contrary to the conjecture, we argue that the ambiguity due to the
bion corresponds to the proliferation of Feynman diagrams. We point out that
the amplitudes of almost all Feynman diagrams are enhanced due to modifications
of the infrared structure of perturbation theory upon an $S^1$ compactification
and twisted boundary conditions. Our findings clarify the role of the
semi-classical object in resurgence structure, which has been a controversial
issue in recent years.
