Alex will be able to project his senses to other places in order to detect things he couldn't sense from his own position. He will also be able to project his senses into other people, and when he does this he will be able to choose whether he shares their senses or shows them what he is currently sensing. Unless he is using this second option, he will be unaware of his surroundings through any sense he is projecting. For example, if he projected his vision around a corner, he would no longer be able to see what is right in front of him, until he brings his vision back.