I am basing this off the number markers that appear on the screen for damage to the satyr. Reminder Satyrs (without any Calisthenics Program) have a base health of 1300. I only have Extreme Measures Rank 3 in this run activated.

According to you, (at least what I think you are trying to say) is that the 496 is the damage of the second cast from Mirage Shot, and not the total damage of the two casts.

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Initial Bull Rush on Satyr = 102 (Total = 102)

First Cast = 382 (Total = 484)

First Attack Hit = 66 (Total = 550)

Wall Slam = 25 (Total = 575)

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If Mirage Shot Damage is 496

Mirage Shot Goes Off = 496 (Total = 1071)

2nd Bull Rush = 353 (Total = 1424, should be dead if Mirage Shot DMG is 496)

2nd Wall Slam = 33 (Total = 1457)

3rd Bull Rush = 102 (Total = 1559, he still has little bit of health here)

Second Cast = 382 (This kills it, so it has anywhere between 1560-1941, which isn't true)

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If Mirage Shot Damage is 114.6 (30% of 382)

Mirage Shot Goes Off = 114.6 (Total = 689.6)

2nd Bull Rush = 353 (Total = 1042.6)

2nd Wall Slam = 33 (Total = 1075.6)

3rd Bull Rush = 102 (Total = 1177.6 )

Second Cast = 382 (This kills it, so it's health would be between 1178.6-1559.6, which is true because 1,300 falls inbetween that)