"He was waterboy and no disrespect to any of the others that run on with messages, but when Dan Lydiate does it, the boys respond," Evans told the Free Press.
"At half-time he gave me some advice in the changing- room and I said, 'I tell you what, you shout it out'.
"I could see every vein bulging in his neck and the boys got the full Alex Ferguson hairdryer treatment. Rather than me doing all the talking Dan stepped up and I think it was a good combination.
"I tried to say some specific technical things and he was screaming, ranting and raving. But it certainly got the response we wanted. It fired the boys up and they battled for all of the second half, if we had another five minutes who knows what could have happened."
Lydiate has been unable to defend his player of the tournament award from the 2012 Six Nations after being sidelined with an ankle injury, but could return for the Dragons against the Ospreys on March 22.
And Evans admits he will face a tough battle to keep the Wales star stealing his spot in the side at blindside flanker, with Lydiate hoping to make a late surge for British & Irish Lions selection this summer.
"Dan's individual contribution to the game is fantastic so we all look forward to having him back at the end of this season," said Dragons skipper Evans, who can also play at No.8.
"With Toby Faletau back as well it will be a really good battle in the back row, but it has been all season to be fair.
"Both Nic Cudd and Ieuan Jones were fantastic against Leinster, Darren Waters is coming back soon and Jevon Groves can move back (from lock). Everyone will be scrapping for spots."
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