kayak as the one vince owned. >> when you're out on the water, you definitely feel the current and the wind. >> reporter: we ask him about angelika's claim that the wind and the current sayak from vince in the water. >> and when she says that she's being blown away from him and that he's being pulled in a different direction? >> yes, that can happen. if he's in the water, he most likely would be going with the current and whereas the kayaks will go with the wind. >> we also know the water temperature that day was 48 degrees. >> correct. >> how quickly after falling into water that cold do you become incapacitated? >> there's that initial cold response and there's panic, your heart rate increases. >> you're basically hyperventilating. >> yeah, you're hyperventilating. grabbing onto this kayak becomes very difficult. being able to tread water or swim with any kind of efficacy becomes very, very difficult. >> reporter: back on shore, a close examination of the kayak shows something detectives at first may not have realized. that critical drain plug, effectively the alleged murder weapon, is not on the bottom of the kayak. it's on top. >> now, this is the infamous plug. >>