Jon Snow is going to be losing two things, maybe not all at the same time:
All memory of how to handle edged/puncture weapons (I'd say "how to fight" but he'll still be ok at punching): if you're canon-familiar, his sword-fighting abilities are going down to "Jaime, post-amputation." He can still bash with a shield, but he won't be able to handle a sword, spear, or bow. He'll carry a dagger but won't have any skill with using it other than anyone else would have at a desperate moment.
All memory of how he got the scars on his chest and the related desire to hide them: this is probably more relevant to his housemates, since he's still not likely to go shirtless around town unless he goes for a swim, but he will not remember the who or why of getting stabbed, or indeed getting fatally wounded at all.
Jon has been in weapons training since he could walk, and at his canon point, he's considered an impressive swordsman; it's a huge part of his identity in a society where he's gained a lot of respect on the basis of these skills. He's killed some formidable opponents and is a pretty good teacher himself. All of that will be gone, and he'll feel pretty vulnerable.
The scars on his chest are from a successful assassination attempt: he was raised from the dead, has a lot of issues about it, and doesn't really like discussing it if he can get around it. The scar over his heart looks like the wound would probably have been fatal, but there are also a bunch of scars lower on his abdomen, seven in all, and they're pretty nasty, twisted and raised and half-healed-looking. While he probably won't agree to discuss this in detail once his memory returns, it opens the door to him potentially discussing it in more detail a little down the line.
My main intentions are for him to look after his housemates, or at least try to. Outside of that, he may need help out of scrapes.
Also, he's recently joined the Guard and will be utterly useless to them for the duration of the event.
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Jon has been in weapons training since he could walk, and at his canon point, he's considered an impressive swordsman; it's a huge part of his identity in a society where he's gained a lot of respect on the basis of these skills. He's killed some formidable opponents and is a pretty good teacher himself. All of that will be gone, and he'll feel pretty vulnerable.
The scars on his chest are from a successful assassination attempt: he was raised from the dead, has a lot of issues about it, and doesn't really like discussing it if he can get around it. The scar over his heart looks like the wound would probably have been fatal, but there are also a bunch of scars lower on his abdomen, seven in all, and they're pretty nasty, twisted and raised and half-healed-looking. While he probably won't agree to discuss this in detail once his memory returns, it opens the door to him potentially discussing it in more detail a little down the line.
My main intentions are for him to look after his housemates, or at least try to. Outside of that, he may need help out of scrapes.
Also, he's recently joined the Guard and will be utterly useless to them for the duration of the event.