how would this interaction play out. Say.... Dutch Vander has a TL on "X" and shoots his TLT, spends his TL and rolls and succeeds on his roll. no he reaquires the TL and a friendly gets one. but can on his second TLT shot use that TL.

Yeah, the second TLT shot is a separate attack, so R5-K6's prohibition against using the target lock he grants during "this attack" wouldn't apply.