TOM JONAS was clearly frustrated standing in Port Adelaide's change rooms after the club's 23-point loss to Geelong on Friday night.

The Power badly lacked composure under pressure against the Cats and kicked the ball out of bounds on the full nine times to once.

After entering the main break down by just seven points, they managed just four scores in the second half to the Cats' 10.

Jonas told AFL.com.au his side was also given a class in generating attack from defence.

Veteran backman Corey Enright was best on ground with 29 disposals and six rebound 50s and six inside 50s, while Tom Lonergan and Jordan Murdoch both rebounded the ball outside of their defensive 50 on five occasions each.

"It was probably a little bit of a step backwards after the last couple of weeks," Jonas said.

"We had been building into this game, we'd played some good footy and tonight we just got a lesson in a few things.

"We were able to bring the pressure in the first half but there were just a few things in the second – we let their backs have a really large influence.

"They gave us a lesson in dropping off.

"We also lacked a bit of composure inside, just fumbling and that inside/outside structure, they were able to hold that really well while we got sucked in."

Jonas' battle with gun Cat Steve Johnson, particularly in the opening half, was riveting.

The niggle between the pair was endless and while Johnson finished the game with 16 possessions and a goal, his influence on the game was minimal.

Jonas also managed to needle his way under the skin of Geelong captain Joel Selwood, who kicked out at the defender after bing tackled before giving away a 50m penalty by slapping him on the back of the head.

"[Johnson] likes to sneak out the back and he also doesn't mind roughing you up – he definitely brings it to you physically," Jonas said.

"It's always a good, fun contest when you're going toe-to-toe physically and he's one that enjoys that as well.

"It's a part of our game that we need to be more consistent with, just being really intimidating and physical with the opposition.

"What happens on the field stays on the field, there's no hard feelings."

At 5-6, Port's season now sits on the brink.

Jonas said the review of Friday night's performance had to be cold: emotionless and objective.

The Power need to start executing otherwise 2015 will quickly become a write-off.

"I try not to get too emotional about it, I just try to look at the figures and analyse the game pretty honestly," he said.

"We've got to look at the tape, do our due diligence, work out what we did wrong and just learn from it.

"Then we need to back it up and go into our bye at 6-6."

Port Adelaide travels to Melbourne to take on Carlton before its bye in round 13.