General comment

Biloxi/Ofo -y- is apparently epenthetic (Ofo would have “tc” otherwise).

Cf. Algonquian forms with *-ʔle:- (Aubin 478, 1014). Biloxi n before an oral vowel and Ofo l suggest that r was in contact with a laryngeal articulation, possibly ʔ. For further discussion, cf. ‘ache’. If this SE hint is to be taken at face value, the Biloxi and Ofo forms relate reasonably well with the Hidatsa and Mandan forms, which also associate r and ʔ in this form. For a possible explanation not involving borrowing, cf. ‘fly (1)’. The two verbs differ in the final vowel -- and differ enough that we currently consider them separate Proto-Siouan derivations.