  We implement D7 flavor branes in AdS-sliced coordinates on $AdS_5\times S^5$
with the ansatz that the brane fluctuates only in the warped ($\mu$) direction
in this slicing, which is particularly appropriate for studying the Janus
solution. The natural field theory dual in this slicing is $\mathcal{N}=4$
super Yang-Mills on two copies of $AdS_4$. Branes extending from $\mu=\pm\pi/2$
can end at different locations, giving rise to quarks with piecewise constant
mass on each $AdS_4$ half-space, jumping discontinuously between them. A second
class of flavor brane solutions exists in this coordinate system, dubbed
"continuous" flavor branes, that extend across the entire range of $\mu$. We
propose that the correct dual interpretation of "disconnected" flavor brane in
this ansatz is a quark hypermultiplet with constant mass on one of the AdS$_4$
half-spaces with totally reflecting boundary conditions at the boundary of
AdS$_4$; whereas the dual interpretation of a continuous flavor brane has
totally transparent boundary conditions. Numerical studies indicate that
AdS-sliced D7 flavor branes of both classes exhibit spontaneous chiral symmetry
breaking, as non-zero vev persists for solutions of the equation of motion down
to zero mass. Continuous flavor branes in this ansatz exhibit many other
surprising behaviors: their masses seem to be capped at a modest value near
$m=0.551$ in units of the inverse AdS radius, and there may be a phase
transition between continuous branes of different configurations. We also
numerically study quark states in Janus. The behavior of mass and vev is
similar in Janus, including the existence of chiral symmetry breaking at zero
mass, though qualitative features of the phase diagram change (sometimes
significantly) as the Janus parameter $c_0$ increases.
