# R2-Q0 — ambiguity pins and ACE-oddity adjudications

The verbatim extraction is `r2-motiontable-decomp.md` (1,603 lines, line-anchored);
the port plan with the full ambiguity table is `r2-port-plan.md` §0. This note
records the PINNED resolutions the Q1–Q5 ports code against.

## Pinned

- **A1 — `get_link` branch predicate: PINNED to ACE's reading** ("EITHER speed
  negative → swapped-key branch"). Three independent corroborations: ACE
  `MotionTable.cs:395-426`; the working adapter's field-validated `GetLink`
  (the reversed-key branch fixed the Ready→WalkBackward glitch); call-site arg
  roles. The BN "both negative" reading is the same x87-flag-noise class as
  `is_newer`'s garbled setcc and the R1 hook-direction swap. cdb confirmation
  (bp `CMotionTable::get_link`, Ready→WalkBackward vs Ready→WalkForward)
  folds into the next live retail session — non-blocking.
- **A2 — Branch-2 `signedSpeed`: PINNED to ACE** (`SubstateMod < 0 &&
  speedMod > 0 → -speedMod`, the single-direction flip) pending the same cdb
  session (golden: a Walk(−)→Walk(+) flip).
- **A3 — outTicks** = sum of each appended MotionData's `num_anims` (+ base
  cycle in Branch 1/2) − 1. The `action_head` rendering in BN is the packed
  `num_anims` byte (decomp's own note).
- **A4 — ACE oddities adjudicated:** (1) Action-branch numAnims double-count =
  ACE BUG, do not copy (retail sums outHop + actionLink [+ returnHop] only);
  (2) `change_cycle_speed` old≈0 silent no-op = RETAIL (port verbatim,
  including the gap); (3) `GetLinkData` 0xFFFF mask = ACE-only helper, not
  ported; (4) `StopObjectCompletely` return = `finalStopOk ? 1 :
  anyModifierStopOk`, port verbatim; (5) `re_modify` snapshot = deep-copied
  MotionState used ONLY as the loop-termination bound — C# port deep-copies,
  pops both, terminates on snapshot empty.
- **A5 — `MotionData.Bitfield`** (bit1 = substate-gated for `is_allowed`,
  bit0 = clear-modifiers-on-entry): confirm on DatReaderWriter
  `Types.MotionData` with a one-line Humanoid-table test at Q2.

## Q0 cdb capture (pending, non-blocking)

One live session feeds all R2 goldens: bp GetObjectSequence / get_link /
StopSequenceMotion / add_to_queue / remove_redundant_links /
truncate_animation_list / AnimationDone / CheckForCompletedMotions with
arg+ret logging (pattern `tools/cdb/l2g-observer.cdb`); protocol per
`r2-port-plan.md` §0. Until then Q2/Q3 rest on dat fixtures + synthetic
state tables + the archived 2026-05-03 walk→run trace golden (quoted in the
old Fix B comment block).