Merger after the 1st or 2nd or 3rd collision?

https://viewer.legacysurvey.org//?ra=308.7229&dec=-62.9933&layer=ls-dr9&zoom=14

this is after the first collision, usually there isn’t that much blue or elongated tails after the second collision, and during the third collision they are almost combined Future Galaxy Merger [Ultra HD] - YouTube