  We resolve the decades old mystery of what happens when a positron scatters
off a minimal GUT monopole in an s-wave, first discussed by Callan in 1983.
Using the language of on-shell amplitudes and pairwise helicity we show that
the final state contains two up quarks and a down quark entangled with angular
momentum stored in the gauge fields, which is the only particle final state
that satisfies angular momentum and gauge charge conservation. The cross
section for this process is as large as in the original Rubakov-Callan effect,
only suppressed by the QCD scale. The final state we find cannot be seen in
Callan's truncated 2D theory, since our entanglement requires more than 2
dimensions.
