Nathan picked up the pace to match the rest of the team once Pyre had joined in the walk. The (probably) thankful slap to his upper back (not covered by Ergia's harness) sent out a thoroughly sodden smack. This seemed to give pause to his partner, as her weapon ignited with purple flames. Nathan angled himself to face the new heat source. "Oh sweet, thanks. Wait, uh, does that burn up Dust?" Upon Pyre's negation with her head, he added "Niice, mine needs Dust - or at least, power - to do it. Don't mind if I do." He then spent the next few minutes slowly turning which side of his body was facing the purple fire, all the while still walking at a constant pace.
After a good while walking in the stream's bed, they arrived at the river in which it ended up. Said river was large and deep, but only had water near its very bottom, some rapids gurgling along. The muddy banks didn't help feeling like one should not simply cross this at their leisure.
When Cyrus suggested carrying someone over, Nathan deactivated Ergia's staff mode, the weapon's stick parts (un)telescoping into the central cylinder. He was the last to give a reply, simply saying "Nah, I've got my ways." He put the now-collapsed Ergia on his back, against its harness. A barely-audible tshak sounded and he tested the links' solidity by pulling at the black object, before putting one knee and both hands to the ground, his back therefore slightly angled upwards. "You all go first, please. And, uh, clear the landing site once you're over. I wouldn't wanna slam into anyone."