Defensive Holding on Kickoff?

[Fedex]

First year official here. Great site. I have learned a lot on these boards. Ok, here's the situation:

R25 receives kickoff at their 20 and runs to his 30 where he throws a lateral across the field to R81 at his own 25. Before the lateral gets to R81, K45 pulls R81 down and the ball is recovered by K at R's 23. Is there a penalty for holding on K45? If so, this would be a loose ball foul, right? Loose ball basic spot is PS, so where would be the PS on a kickoff? Would they have to kickoff again?

I had a situation similar to this, except that K made a play for the ball instead of holding the player. It got me thinking to what if K held/tackled the player trying to recieve the lateral.

Thanks!