But because this is a sequential reaction, just like in the order sequential reaction case, we have to actually form that ternary structure, that structure that contains the enzyme bound to the two substrate molecules, in this case ATP and creatine. Only when we form this three molecule complex can we begin the process of catalyzation. And only now can we transform the ATP into the ATP and the Creatine into the phosphorine. So basically what the enzyme does is it catalyzes the transferring of the phosphate group from the ATP onto that Creatine molecule to create the high energy phosphor Creatine that can be used by the muscle cells as a high energy source. Now, once we form these two products, now these two products can be released from the active side, but because we're dealing with a random sequential reaction, unlike in this case, in this case it doesn't matter which one of these products is released first. We can either have the ADP come out first, followed by the phosphor Creatine, or we can have the phosphorus Creatine released first followed by that ADP.