Continuation of this post.
And finally, he calls again to ask about the political favor, and remind Comey of his pledge of loyalty. Saying the word loyalty, and reminding him of that thing they had. Comey tells Trump he basically isn't going to do it and to then direct his request to the acting AG. Failing Trumps final test of loyalty.
Comey was then fired. Trump clearly implied that if Comey wasn't loyal he would be replaced, clearly though honest loyalty implied Comey would back him, and clearly made an inappropriate request in an attempt to influence an investigation. When Comey didn't perform that request, Trump tested him on a lesser ask to gauge his loyalty. Found Comey didn't intend to compromise himself, and then fired him.
It's clearly obstruction of justice, he asked for loyalty, then made an ask expecting it would get done. When it didn't he asked for something else to feel out Comey, and when that didn't get done he wrote Comey off and fired him. No doubt, Comey's replacement Christopher Wray had a more direct conversation about loyalty.