This pattern is measured from point X to point C like the Cypher pattern. Both have valley 2 lower than valley 1 in the bearish versions, peak 2 will be higher than peak 1 in the bullish versions (flipped over). These 2 patterns are labeled XABCD.
The Shark is measured using the OX leg which is leg 1 and is labeled OXABC.
This pattern also has valley 2 lower than valley 1 in the bullish version and peak 2 higher than peak 1 in the bullish version. The impulse wave, OX, is down in the bearish version and appears like a crooked W as does the Nen-Star and Cypher patterns in their bearish versions.
All 3 patterns are similar in appearance but each have certain fib levels that differentiate them from each other.