Do nested functions reduce performance? - actionscript-3

Question

I have a class UglyLobster in a sidescroller-type game that uses artificial intelligence in AS3. UglyLobster is a largely self-operating class that determines what it will do next based on the environment. As I am building this artificial intelligence, I find the easiest solution is to use nested functions.
However, I am uncertain if nested functions will affect the performance and cause drag. This UglyLobster is not limited to one instance; many will be running at the same time. I've added code to show what I'm trying to do.
public class UglyLobster extends Mob {
//these vars determine what the UglyLobster will do next
public var behavior = "aggro"
private var behaviorStep:int = 1
public function UglyLobster() {
addEventListener(Event.ENTER_FRAME,performBehavior)
}
public function performBehavior(e) {
if (behavior == "aggro") {
aggro()
}
if (behavior == "tranq") {
tranq()
}
}
private function aggro() {
//it is necessary to have multiple steps.
//in step 1, the Lobster could bare its lobster fangs,
//then in step 2, crawl toward a point
//and in step 3, pinch somebody
if (behaviorStep == 1) {
step1()
}
if (behaviorStep == 2) {
step2()
}
if (behaviorStep == 3) {
step3()
}
function step1() {
if (someCondition) {
behaviorStep = 2
} else {
//do whatever happens in step1
}
}
function step2() {
if (someOtherCondition) {
behaviorStep = 3
} else {
//do whatever happens in step2
}
}
function step3() {
if (anotherCondition) {
behaviorStep = 1
} else {
behavior = "tranq"
}
}
}
private function tranq() {
//do nothing
}
}
Are the nested functions a memory-efficient way to complete the task? If not, how would you set up an artificial intelligence for UglyLobster? Examples would really help

Answer 1

Even if i don't like this kind of design and probably, as Jason suggested, there is an architectural design problem, i think there is no need for nested functions.
private function aggro() {
//it is necessary to have multiple steps.
//in step 1, the Lobster could bare its lobster fangs,
//then in step 2, crawl toward a point
//and in step 3, pinch somebody
if (behaviorStep == 1) {
step1()
}
if (behaviorStep == 2) {
step2()
}
if (behaviorStep == 3) {
step3()
}
}
private function step1() {
if (someCondition) {
behaviorStep = 2
} else {
//do whatever happens in step1
}
}
private function step2() {
if (someOtherCondition) {
behaviorStep = 3
} else {
//do whatever happens in step2
}
}
private function step3() {
if (anotherCondition) {
behaviorStep = 1
} else {
behavior = "tranq"
}
}