It was Samoan international Tuifua's third appearance for the club, since joining the Blues in January on a short-term contract until the end of the season.
Despite the result, Davies had no complaints with his side's work rate, as Kristian Dacey, Gareth Davies and Dan Fish each dotted down in vain.
And he was pleased with Tuifua's best performance yet in a Blues shirt, as the centre epitomised the team's attitude - as well as standing out in his brightly-coloured footwear.
"All the players ran themselves to a standstill against Leinster and you can't ask for more than that," Davies told the club website.
"We had to take a few of the boys off because they were literally out on their feet - we kept playing until the very end and all credit to them.
"It was good to see Isaia play like that too. That game showed up more of the reasons of why we brought him here. He is going to have to keep those pink boots too - they were quite inspirational for him.
"It's still achievable for us to reach sixth in the table and because that is the case we are going to keep going for it."
Follow us on Facebook, join the conversation onTwitter,sign up to our YouTube channel for extensive match highlights and sign up to our newsletter for regular updates on the RaboDirect PRO12
Guinness PRO12 Blues News
63x46.png){kind=logo}