Later AIS data, with a corrected time and location of collision, along with speed data on the ACX Crystal tells an entirely different story -- posted in my #204 on that same thread -- and including this second custom graphic:
I recommend that you all read my comments that accompany that graphic.
CONCLUSION: instead of the ACX Crystal's bizarre maneuvering concluding with the collision, it now appears that The collision is what initiated the bizarre maneuvering -- and that the ACX Crystal did, indeed make that U-turn in order to return and offer aid to the Fitzgerald.