Annotatio II §.IX (2): First Institution — body at table, not in bread; else two bodies / self-eating
(2) At the first Institution Christ’s body was corporally at the table — so not corporally in the bread.
If it was in the bread while He Himself ate with the disciples (Matt. 26:29; Mark 14:25), He ate His own flesh in and under the bread — whole body and soul in His mouth — hence either multiplication of one body, or two bodies (one eating, one eaten).
Latin
(2) Circumstantiis primæ Institutionis: Corpus enim Christi fuit tum temporis corporaliter ad mensam, seu mensæ corporaliter accubuit, adeoque Corporaliter in pane non fuit. Item, quòd si corpus Christi corporaliter in pane tum fuit, cùm Christus Sacramentum Coenæ instituturus, ipsemet panem cum discipulis edit. Matth. 26. 29. Marc. 14. 25. sequetur, eundem in & sub pane, suam propriam carnem comedisse; adeoque totum suum corpus & animam, tum temporis in ore habuisse: hincque adeo, vel multiplicationem esse factam ejusdem corporis Christi, vel duo Christum habuisse corpora, unum continens & comedens, alterum contentum & comesum.