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Busted Toon Shader

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I'm getting a nasty tesselation-based artifact when I use my Toon shaders. Here is the output: Here's the vertex shader:
void main(float4 position		: POSITION,
		  float4 normal		: NORMAL,

		  out float4 oPosition	: POSITION,
		  out float3 oNormal	: TEXCOORD0,

		  uniform float4x4  modelViewProj,
		  uniform float4x4  modelViewIT)
{
	oPosition = mul(modelViewProj, position);
	oNormal = mul(modelViewIT, normal).xyz;
}

And the fragment shader:
void main(float4 position  : TEXCOORD0,
          float3 normal	   : TEXCOORD1,
		  
	  out float4 color : COLOR,
		  
	  uniform float3 lightPosition,
	  uniform float3 eyePosition,
	  uniform float4 Kd,
	  uniform float4 Ks,
	  uniform float	 shininess)
{
	float3 N = normalize(normal);
	float3 L = normalize(lightPosition - position.xyz);
	float3 V = normalize(eyePosition - position.xyz);

	float intensity = dot(N, L);
	if (intensity > 0.95f) {
		color = float4(1.0f, 0.5f, 0.5f, 1.0f);
	} else if (intensity > 0.5f) {
		color = float4(0.6f, 0.3f, 0.3f, 1.0f);
	} else if (intensity > 0.25f) {
		color = float4(0.4f, 0.2f, 0.2f, 1.0f);
	} else {
		color = float4(0.2f, 0.1f, 0.1f, 1.0f);
	}
}

I have Phong shaders that work the same way and there are no similar artifacts. Any idea what's happening? T

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