The initial words brought the wolf around with a low, warning growl. Though it wasn't a 'I'm going to rip your head off' sort of noise. More of a 'don't come any closer' warning. His legs had stiffened, ears and tail up as he surveyed the intruder. Nik was still in there, but running in his four legged form for an extended period of time left the wolf instinct far more influence than it would otherwise have.
For a long moment he'd just stare at Logan, eyes locked to the older man's as his nose flared and he finally got a clear scent of the one who had been on his trail. That was the first thing that shook the wolf, an ear flicking back, then pricking up again as Nik processed this information. Combined with the 'my boy' words...oh, not good. There was part of him that wanted to leap at the older man when the low growl was heard, but the human in him overrode the instinct. With a sound that started out as growl, but trailed off into a whine, the wolf crouched slightly, tail dropping and ears tucking back to his skull.
Indeed, the black-furred feral could not speak in this form, but the body language for the moment was clear enough. He didn't want to fight. Logan smelled like Karr, and this was as much of an apology as he could offer in this four legged shape. Yes, it was a submissive gesture, but right about now Nik was ok with that. If anyone had the right to kick the shit out of him, it was Karr's father.
After a moment, long enough to ascertain whether or not Logan was going to attack, Nik would start to shift. It was a fairly quick process, leaving the wolfman crouched on the ground in front of Logan breathing heavily. The faster he forced the change, the more effort it took. Perhaps sensing the potential for violence, he didn't rise to stand on two feet. Just remained crouched on four, tail still down and ears folded back as he watched Logan's chest. Both for hints of sudden movement and because it was less challenging than watching the eyes. "I can only speak in this form." The 'almost' part of the statement seemed to have escaped his notice, so deep was he in the guilt of having killed another man accidentally.