  SU(3) gauge theory with eight massless flavours is believed to be walking,
while the corresponding twelve- and four-flavour appear IR-conformal and
confining respectively. Looking at the simulations performed by the LatKMI
collaboration of these theories, we use the topological susceptibility as an
additional probe of the IR dynamics. By drawing a comparison with SU(3) pure
gauge theory, we see a dynamical quenching effect emerge at larger number of
flavours, which is suggestive of emerging near-conformal and conformal
behaviour.
