El Submarino Amarillo found themselves 1-0 down after just 10 minutes due to Kevin Prince-Boateng's strike and suffered a further setback when Ruiz was given his marching orders for a last-man challenge on the same player.
Despite their deficit, the visitors dominated large swathes of the game at the Estadio Gran Canaria but could not make the breakthrough.
Speaking afterwards, Escriba admitted he was pleased with his side's efforts but says the early red card left them with a mountain to climb.
He is quoted as saying by the club's official website: "We have to be satisfied with the team because they gave everything, created many chances for only having ten men, played well and if you take risks you're bound to concede a chance.
"The sending off affected us a lot. We didn't want anything to happen until the break and in the end by taking plenty of risks we almost equalized."