It has been pointed out in several episodes of Quantum Leap that Sam Beckett can only travel trough time within his own lifetime. But what about those he leaps into?

When he leaps into someone else, he switches places with that person, who are then transported to the future (1999). I am nitpicking here, but would the person he switches places with have to be alive in 1999 for the leap to work? I am only asking this question because there are some cases where Sam would leap into someone, then we find out from Al, that the person he leaped into would be dead, sometimes in a matter of days. Therefore, that person would not live to see 1999. So how does the leap work, if the other person is dead and you can only leap within your own lifetime? Sure, you could say that Sam changed history so that the other person could live to see 1999, making the leap possible; but lets say that is not the case.

It has been pointed out in several episodes of Quantum Leap that Sam Beckett can only travel through time within his own lifetime. But what about those he leaps into?

When he leaps into someone else, he switches places with that person, who is then transported to the future (1999). I am nitpicking here, but would the person he switches places with have to be alive in 1999 for the leap to work? I am only asking this question because there are some cases where Sam would leap into someone, then we find out from Al that the person he leaped into would be dead, sometimes in a matter of days. Therefore, that person would not live to see 1999. 

So how does the leap work if the other person is dead and you can only leap within your own lifetime? Sure, you could say that Sam changed history so that the other person could live to see 1999, making the leap possible, but let's say that is not the case.

It has been pointed out in several episodes of Quantum Leap that Sam Beckett can only travel trough time within his own lifetime. But what about those we leaps into? When he leaps into someone else, he switches places with that person, who are then transported to the future (1999). I am nitpicking here, but would the person he switches places with have to be alive in 1999 for the leap to work? I am only asking this question because there are some cases where Sam would leap into someone, then we find out from Al, that the person he leaped into would be dead, sometimes in a matter of days. Therefor, that person would not live to see 1999. So how does the leap work, if the other person is dead and you can only leap within your own lifetime? Sure, you could say that Sam changed history so that the other person could live to see 1999, making the leap possible; but lets say that is not the case.

It has been pointed out in several episodes of Quantum Leap that Sam Beckett can only travel trough time within his own lifetime. But what about those he leaps into? 

When he leaps into someone else, he switches places with that person, who are then transported to the future (1999). I am nitpicking here, but would the person he switches places with have to be alive in 1999 for the leap to work? I am only asking this question because there are some cases where Sam would leap into someone, then we find out from Al, that the person he leaped into would be dead, sometimes in a matter of days. Therefore, that person would not live to see 1999. So how does the leap work, if the other person is dead and you can only leap within your own lifetime? Sure, you could say that Sam changed history so that the other person could live to see 1999, making the leap possible; but lets say that is not the case.