Yeah it just kind of depends on how long it takes them to figure out to go right for Eren and how long it takes Eren to figure out "oh holy fuck these guys are strong I should get away" lolLuffy is the sort to just go straight for the main one which Founding Titan obviously seems to be on his end. Haki is also a thing so Eren is getting slapped. Would be funny if conqueror's haki worked on them too