I think both Newcastle and Liverpool played very well, Liverpool managed to comeback during injury time, while Newcastle can manage to equalize the scores even though they're only playing with 10 players.
Rather than trying to sign Isak, it's better for Liverpool to pay attention with their defending line, I think they have to sign more defenders.
Luckily for Liverpool, they managed to score a winning goal in additional time through Ngumoha so that they could secure three points.
Ngumoha is just sixteen, he has a good mentality since he's not afraid to play in St James Park.