  Vectorlike quarks have been shown to resolve certain long-standing
discrepancies pertaining to the bottom sector. We investigate, here, the
prospects of identifying the existence of a topless vectorlike doublet
$(B,~Y)$, as is preferred by the electroweak precision measurements.
Concentrating on single production, $viz.$ $B \bar b$ with $B
  \to b + Z/H$ subsequently, we find that the fully hadronic decay-channel is
susceptible to discovery provided jet substructure observables are used. At the
13 TeV LHC with an integrated luminosity of 300 fb$^{-1}$, a modest value of
the chromomagnetic transition moments allows for the exclusion of $M \lesssim
1.8(2.2)$ TeV in the $Z$ and $H$ channels respectively.
