Let's be real, neither one of them know how disastrous an attempt at carrying all of them would be. Neither one.
Nonetheless, Gordin gladly (with a subtle stretch) resumes heading for the river, complete with suitably heroic humming to accompany their noble journey. ...He's so proud of it that he almost misses the fact that they're soon at their first landmark until he nearly bodily throws himself into the water.

Play it cool man, play it cool. Surely Cu Chulainn won't have noticed his slip-up? "And here we are, young master! At the river! Can you see the shop from here?"