Charles was concentrating so much as he was being put into the jet, his eyes closed, he was going to have to rely on Jean to tell the others he was ok.
He wasn't about to leave Laura behind and certainly not going to leave any mutant behind with Stryker.
As Julian dodges out of the way, Charles replaces him with a projected imitation. It responds like the real thing, her punch connecting to throw it back against the wall, splayed out painfully as it's nose bleeds. To Laura, she will think she has hit and possibly killed Julian when he is off to the side safe and sound and hidden from her view.
He gives Julian and Wolverine a telepathic message, Hold off for a moment, give her some room. If he can convince her she's killed Julian, her programming will be satisfied in thinking she's stopped him.