Doesn't seem to be much 'Slip N Slide' about it, looking at the wheel tracks in the photos.
Looks like it might be at the very tight turn from TWY E towards the usual gate - greater than 90°, and easy to be unsighted in the opposite seat. Viz in the photos looks OK. 20/20 hind sight says taking/requesting the longer route to the gate might have been a better option.
One point of note: the majority of FO's I have flown with on the 777 in recent years (many of whom are now or will soon be captains) demonstrated ignorance of the correct cues when taxiing and turning through 90° or more, with the potential end result exactly as seen here.
Standby for taxi practice at the next PPC.
TM