Why was Vision so powerless in Infinity War even though he possessed an Infinity Stone?

OI answered it for a similar question, so repeating it here as well.

That’s what happens when you fall in love. Jokes apart, serious answer beyond the spoiler marking.

———————————————SPOILERS—————————————————-

He is not technically under-powered.

First you might be aware of one of Vision’s most important powers-Phasing. This is basically him being able to let anything go through him and vice versa. This helps him escape attacks from the enemy and almost never get hurt. Since he is an android he doesn’t lose much of stamina either (again because he never gets hurt) 

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So this happened at the beginning of the movie. When Vision and Wanda are attacked, one of the members of the Black Order named Corvus Glaive stabs him using a spear that he always carried. 

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Corvus dude ^

Image Courtesy: Marvel Studios

That stab actually stopped him from phasing. It could be because of the power of the spear or because some part of the spear was left inside him. And since he couldn’t phase all the other subsequent attacks had an adverse reaction on him.

Add to that the attack on the stone on his forehead, falling down on a station from the sky whilst saving Wanda, getting his ass kicked and perhaps more importantly becoming weaker because all the stones were getting in close proximity(his body also reacted whenever someone came after him, or someone was tracking him). 

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But really it was falling in love that screwed Vision, guess even Android aren’t safe. :D

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Edit 1: Corvus’ gender is male, and he is Proxima’s paramore in comics. Thanks Ketan

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