M Puzzle: Marching Bands (untitled)

by Matt Jones

The answer grid, followed by the clues in the order presented, is as follows:

CRYBABY
DOMENICO
ABLA
PROVERBS
MAYPOLE
TALON
TIBETAN
ALLIUM
VIDEO
MODAL
HORACE
NUEVO
HYDRIDE
ILIAC
ALTRUISM
GELEE
FUNYUN
RULA
CLING
GLOBOSE
ABILENE
ALDRIN
ANON
NEMESIS

USE ME NARC UNHOLY MARLBORO LASSOED LLULL RUIS ANGELENO OBOL DIDN'T MEDICI BUOY A FACT ENEMY MAYPO LET ALONE CINERARY NAIAD NOVEM CUBA LIBRE GANDHI BILE INGA IVES VORPAL I BET

To read the "B6/6b/2a/C1/10a 5a/A6/9b 7a B2/D2", if the pair starts with a letter, it's a Band answer; if it starts with a number, it's a Row answer. Take the nth word appearing in order in the Band answer, or the first or second word ("a" or "b") in each Row answer. The answers taken in order are LLULL/ALLIUM/TIBETAN/INGA/NUEVO FUNYUN/OBOL/RULA ILIAC ANGELENO/MARLBORO. Reading the initial letters of each word forms "LATIN FOR I AM," which is SUM, the answer.

Training:

The desire to shatter a pane of glass is a clue to use Windows to train this. Using the overlay from the Whoa! I Know Windows! cryptic and reading through the square holes gives you this:

Reading from top to bottom, you get GAHLYCRB. Adding that to SUM by interweaving the two words without rearranging any letters gives the final answer, GASHLYCRUMB.