What does a child experience during alienation?

“Alienating parents can limit or even cut off the child from the other parent. The term “amputating parent” as been used to describe what the parent does overall but is particularly apt in this instance. This can be done a number of ways, either by the above tactic of making this the child’s choice, or by sabotaging visits with the other parent.”
https://blogs.psychcentral.com/therapy-soup/2019/02/damage-done-by-parental-alienation/