help with feeding problemplease! ASAp

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My red sided garter was fed a pinky this morning, but it seems a combination of it being large and the silly snake trying to swallow it on an angle is preventing it from going down. Its all the way in his mouth now but he is resting... Its too far down for me to try and pull out if thats what is needed tobe done, but I am worried he will asphixiate or choke. Is there anything I can do or just hope he manages it and keep an eye on him?
I will be checking this board for teh next hour as I figure in that time I will know what to do, he will of swallowed it, or worse.
Thanks in advance for any help!