See even after this chapter I still have this eerie feeling more than ever that there is a level of betrayal coming from Shanks to Luffy. It just feels like he's using him for something (be it for a Nika for whatever reason), and how is it that Oda has only ever drawn Apoo and Kanjuro this way (looking to their left)? Especially because looking away generally means someone isnt being truthful (all of Luffy's silly gags for example when he's shit at lying lol)
Like for Kanjuro and Apoo, these volume covers came out hundreds of chapters before their betrayals were known.
Just seems like its too purposeful to be a coincidence to me, and attacking Barto this violently really just adds to the point om making. Let alone his Gorosei meeting or thousand odd looks he gives when he talks about Luffy or his goals.