Get the positions of the player and of the enemy. Subtract those two and use the resulting vector as the direction vector for the velocity. No angle calculations required.
EDIT:
Kinda tricky with the conditions that you set, but here's a workaround to not being able to use a non-kinematic rigidbody:
var fDistOfKnockback : float = 2;
var dirVector : Vector3 = (enemy.transform.position - transform.position).normalized * fDistOfKnockback;
var newEnemyPos : Vector3 = enemy.transform.position + dirVector;
Vector3.Lerp(enemy.transform.position, newEnemyPos, t);
That's obviously pseudocode only, but it shows the theory. Basically, once you get the direction vector that your enemy is supposed to be knocked back towards, get a position a certain distance away from the enemy's position that's within the path of the direction vector. Then lerp your enemy towards that new position to simulate knockback.
Prolly not the best way, but it works given the constraints we're working with.
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