diff --git a/pitfall/fontkit/layout-engine.rkt b/pitfall/fontkit/layout-engine.rkt
index 1c5c36f2..853359fd 100644
--- a/pitfall/fontkit/layout-engine.rkt
+++ b/pitfall/fontkit/layout-engine.rkt
@@ -54,7 +54,7 @@ https://github.com/mbutterick/fontkit/blob/master/src/layout/LayoutEngine.js
      ;; Substitute and position the glyphs
      (set! glyphs (send this substitute glyphs features script language))
      (report/file 'end-sub)
-     (error 'stop)
+     #;(error 'stop)
      (report/file 'ready-position)
      (define positions (send this position glyphs features script language))
      (report/file 'fired-position)
diff --git a/pitfall/fontkit/ot-processor.rkt b/pitfall/fontkit/ot-processor.rkt
index 4b7846cf..c306a7c3 100644
--- a/pitfall/fontkit/ot-processor.rkt
+++ b/pitfall/fontkit/ot-processor.rkt
@@ -146,7 +146,7 @@ https://github.com/mbutterick/fontkit/blob/master/src/opentype/OTProcessor.js
     (define pos (· this glyphIterator index))
     (define glyph (send (· this glyphIterator) increment sequenceIndex))
     (define idx 0)
-    (report*/file (list-ref sequence idx) glyph (and glyph (· glyph id)))
+    (report*/file (and (pair? sequence) (list-ref sequence idx)) glyph (and glyph (· glyph id)))
 
     (while (and (< idx (length sequence)) glyph (fn (list-ref sequence idx) (· glyph id)))
            (report* 'in-match-loop idx (· glyph id))
@@ -164,6 +164,7 @@ https://github.com/mbutterick/fontkit/blob/master/src/opentype/OTProcessor.js
     (send this match sequenceIndex sequence (λ (component glyph) (= component glyph)) empty))
 
   (define/public (coverageSequenceMatches sequenceIndex sequence)
+    (report 'in-coverageSequenceMatches)
     (send this match sequenceIndex sequence (λ (coverage glyph) (>= (send this coverageIndex coverage glyph) 0))))
 
   (define/public (getClassID glyph classDef)
@@ -235,9 +236,9 @@ https://github.com/mbutterick/fontkit/blob/master/src/opentype/OTProcessor.js
     [(3)
      (report 'case-3)
      (and
-          (send this coverageSequenceMatches (- (· table backtrackGlyphCount)) (· table backtrackCoverage))
-          (send this coverageSequenceMatches 0 (· table inputCoverage))
-          (send this coverageSequenceMatches (· table inputGlyphCount) (· table lookaheadCoverage))
+          (report (send this coverageSequenceMatches (- (· table backtrackGlyphCount)) (· table backtrackCoverage)) 'a)
+          (report (send this coverageSequenceMatches 0 (· table inputCoverage)) 'b)
+          (report (send this coverageSequenceMatches (· table inputGlyphCount) (· table lookaheadCoverage)) 'c)
           (send this applyLookupList (· table lookupRecords)))]
     [else #f]))
 
diff --git a/pitfall/pitfall/test/test16rkt.pdf b/pitfall/pitfall/test/test16rkt.pdf
index e69de29b..4ff081a5 100644
Binary files a/pitfall/pitfall/test/test16rkt.pdf and b/pitfall/pitfall/test/test16rkt.pdf differ