Two scenarios involving an offensive player moving into the path defensive player

[MiamiWadeCounty]

Scenarios 1:

LBJ is on the FT line with the ball. Wade, being guarded by Kobe, runs across the paint with Kobe trailing him. LBJ moves into Kobe's path without giving Kobe the opportunity to avoid contact, attempts a jump shot and a collision occurs.

Illegal screen on LBJ? Or defensive foul by Kobe?

Scenario 2:

B1 moves in with 100% max speed to guard A1 (with or without the ball) and establishes a path that would avoid A1. A1 moves into B1's path without giving B1 the opportunity to avoid contact. Collision occurs.

(Note that B1 is never airborne. B1 is simply trying to guard A1 or contest A1's shot but A1 moves into B1's path that would have avoid contact.)

What do you have?