The Power of Guilt

Magnus realized that it was the spell that made Alec jump off of that ledge. But he also knew that spells cannot simply create feelings. They can only take what's already hidden in someone's mind, twist it and turn it, until there's a new reality born. Therefore he knows that a part of Alec truly believed death was the only optioned after Jocelyn died. He knew his dear Alec carried the blame on his shoulders and he was afraid that one day, it would be too much for him to take. He himself was used to have that kind of feelings and he doesn't want Alec to not come back home one day. That's why he decides to talk to him about it. As someone who can understand him and help with bearing such a burden.