The Lions and Ospreys wing had two half-chances and took them in clinical style, scoring first off a charge-down from the excellent Luke Charteris, then snaffling a Fernandez Lobbe grubber to go under the posts.
He followed that up by getting off the floor to tackle full-back Olly Morgan, yielding a richly deserved penalty for the wing which fly-half Jones landed.
The French side's momentum finally told, the Blues defence stretched by repeated batterings to allow Skrela to send wing Arias into a half gap for a converted try.