Agree, 90/180 degree random turns, frequently changing speed, and a nightmare to get hold of on the radio, even when you do there's sometimes a long wait while the message gets passed down the line to the person actually driving the thing.
Only to throw my tuppence in, looking at that radar replay there's quite a few things that interest me.
Warship of course seems to have no idea what's going on. Poor tanker is boxed in unless they can crank round to starboard a bit more, bleating Rule 13 to those overtaking vessels hoping they're paying attention and also have space to get out the way a bit with that other southbound target. As it appears they were all passing pretty close too, that second overtaking vessel had to do a round turn anyway when the Sola hit the tanker as they nearly got taken out too in the whole thing.
I don't know the area, depth of water, etc, etc, disclaimer etc, but from the radar replay, it looks rather narrow and the Sola looks to have taken a very close course to that western headland before the whole fun and games kicked off.
Incidentally, in that translated page, I didn't half enjoy this little snippet: