In measure 12 a C appears in a D chord. The C functions as the seventh scale degree in a D7 chord (D, F#, A, C).
This choice is interesting as the previous material is derived from the G major pentatonic hybrid discussed
earlier. In this case it seems as though Allen is using the C to “surround” the upcoming B, in measure 13,
which is a chord tone in G. C is a half step above B, and the A#/B-flat is a half step below the B, therefore,
Allen “surrounds” the chord tone with half steps before resolving to the destined tone B. Since the C is harmonically functional in D,
it could be that Allen wanted to play the proper chord tone over the dominant, however, the use of the G major pentatonic hybrid
for the previous measure and a half discredits this theory.