Both Salah and Firmino scored and assisted each other in the Reds’ 2-0 win over Southampton yesterday.
The Egyptian’s composed finish made it 29 goals in all competitions, while his Brazilian team-mate’s goal was his 20th.
In particular, the two attackers displayed their telepathic understanding for Liverpool’s second strike.
“If he flicks it too early, the players will get it,” Henry said on Sky Sports.
“But he waits a bit, goes around the ball and flicks it back towards the path of Salah.“
“They do [look like they enjoy being on the pitch together]. Obviously it helps when we saw what we saw today, they combine a lot.
“Salah knows that Firmino is going to drop and he can run in behind, when he gives him the ball, he usually knows that he will receive the ball back.
“Obviously Salah has just arrived so it’s still early between those two but you can see a great partnership developing there.”
Liverpool’s 15th win of the season leaves them third, just two points behind Manchester United.