I dont think its XP stealing, i help arm if it is needed, for example at the oasis wall under fire you need to get that dyna armed rapidly, and i wouldnt mind any one helping me. Of course, i do mind someone defusing and planting their own. I didnt think people would actually do that till i saw it myself. The engineer was at the dynamite, i was like wtf is he doing? no, surely not, omfg he is, he disarmed my dyna and planted his own, man that is low. he did get a good powering from the rest of teh team, several team mates saw it.
thats when you give a warning (maby a shot ot 2) and/or call a vote, (bew sure to explain your reason for the vote tho!!) XP whores like that take the fun and and friendly competition out of the game!
apo`bgwho ever fills the last pixel of the construction bar gets the xp. If some1 was building the bridge under heavy gunfire and gets killed JUST before he finishes, he won't get any xp :( (well if some upright and honest fellow engy passes by and decides to place a mine on the construction crates, so the 1st engy gets some extra energy it would be very lovely...:)) But what most annoys me is when I place a dyno somewhere and then some f**king teammate passes by, decides "I want some easy xp", disarms my dyno and arms his own...thats veeeery cheap. Or disarms my mine and places his own ones...
On my server, I kick people for that.